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The derivative of the function 
f is defined by 
f^(')(x)=(x^(3)-2x)cos(3x). If 
f(-1)=8, then use a calculator to find the value of 
f(3) to the nearest thousandth.
Answer:

The derivative of the function f f is defined by f(x)=(x32x)cos(3x) f^{\prime}(x)=\left(x^{3}-2 x\right) \cos (3 x) . If f(1)=8 f(-1)=8 , then use a calculator to find the value of f(3) f(3) to the nearest thousandth.\newlineAnswer:

Full solution

Q. The derivative of the function f f is defined by f(x)=(x32x)cos(3x) f^{\prime}(x)=\left(x^{3}-2 x\right) \cos (3 x) . If f(1)=8 f(-1)=8 , then use a calculator to find the value of f(3) f(3) to the nearest thousandth.\newlineAnswer:
  1. Integrate f(x)f'(x) for f(x)f(x): To find the value of f(3)f(3), we need to integrate the derivative f(x)f'(x) to get the original function f(x)f(x). We will then use the initial condition f(1)=8f(-1) = 8 to find the constant of integration.
  2. Apply Integration by Parts: First, we integrate f(x)=(x32x)cos(3x)f'(x) = (x^3 - 2x)\cos(3x). This requires integration by parts or a special technique since it is a product of a polynomial and a trigonometric function.
  3. Integrate Second Part: Let's set u=x32xu = x^3 - 2x and dv=cos(3x)dxdv = \cos(3x)dx. Then we need to find dudu and vv.du=(3x22)dxdu = (3x^2 - 2)dx and v=(13)sin(3x)v = (\frac{1}{3})\sin(3x).
  4. Apply Integration by Parts Again: Now we apply integration by parts: udv=uvvdu\int u\,dv = uv - \int v\,du. (x32x)cos(3x)dx=(x32x)(13)sin(3x)(13)sin(3x)(3x22)dx\int(x^3 - 2x)\cos(3x)\,dx = (x^3 - 2x)(\frac{1}{3})\sin(3x) - \int(\frac{1}{3})\sin(3x)(3x^2 - 2)\,dx.
  5. Integrate Simple Part: We need to integrate the second part: (13)sin(3x)(3x22)dx\int(\frac{1}{3})\sin(3x)(3x^2 - 2)\,dx. This requires another integration by parts or a substitution.
  6. Combine All Parts: Let's set u=3x22u = 3x^2 - 2 and dv=(13)sin(3x)dxdv = (\frac{1}{3})\sin(3x)dx. Then we need to find dudu and vv.\newlinedu=6xdxdu = 6xdx and v=(19)cos(3x)v = -(\frac{1}{9})\cos(3x).
  7. Use Initial Condition: Now we apply integration by parts again: udv=uvvdu\int u\,dv = uv - \int v\,du.13sin(3x)(3x22)dx=(3x22)(19)cos(3x)(19)cos(3x)(6x)dx\int\frac{1}{3}\sin(3x)(3x^2 - 2)\,dx = -(3x^2 - 2)\left(\frac{1}{9}\right)\cos(3x) - \int-\left(\frac{1}{9}\right)\cos(3x)(6x)\,dx.
  8. Calculate Constant C: We need to integrate the second part: (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx. This requires a simple integration.
  9. Find f(3)f(3): The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx is 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx, which requires another integration by parts.
  10. Find f(3)f(3): The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx is 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx, which requires another integration by parts.Let's set u=xu = x and dv=(29)cos(3x)dxdv = -(\frac{2}{9})\cos(3x)\,dx. Then we need to find dudu and vv.du=dxdu = dx and v=(227)sin(3x)v = -(\frac{2}{27})\sin(3x).
  11. Find f(3)f(3): The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx is 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx, which requires another integration by parts.Let's set u=xu = x and dv=(29)cos(3x)dxdv = -(\frac{2}{9})\cos(3x)\,dx. Then we need to find dudu and vv.du=dxdu = dx and v=(227)sin(3x)v = -(\frac{2}{27})\sin(3x).Now we apply integration by parts again: udv=uvvdu\int u\,dv = uv - \int v\,du.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx00.
  12. Find f(3)f(3): The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx is 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx, which requires another integration by parts.Let's set u=xu = x and dv=(29)cos(3x)dxdv = -(\frac{2}{9})\cos(3x)\,dx. Then we need to find dudu and vv.du=dxdu = dx and v=(227)sin(3x)v = -(\frac{2}{27})\sin(3x).Now we apply integration by parts again: udv=uvvdu\int u\,dv = uv - \int v\,du.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx00.The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx11 is (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx22.
  13. Find f(3)f(3): The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx is 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx, which requires another integration by parts.Let's set u=xu = x and dv=(29)cos(3x)dxdv = -(\frac{2}{9})\cos(3x)\,dx. Then we need to find dudu and vv.du=dxdu = dx and v=(227)sin(3x)v = -(\frac{2}{27})\sin(3x).Now we apply integration by parts again: udv=uvvdu\int u\,dv = uv - \int v\,du.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx00.The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx11 is (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx22.Now we combine all the parts to get the integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx33:(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx44, where (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is the constant of integration.
  14. Find f(3)f(3): The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx is 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx, which requires another integration by parts.Let's set u=xu = x and dv=(29)cos(3x)dxdv = -(\frac{2}{9})\cos(3x)\,dx. Then we need to find dudu and vv.du=dxdu = dx and v=(227)sin(3x)v = -(\frac{2}{27})\sin(3x).Now we apply integration by parts again: udv=uvvdu\int u\,dv = uv - \int v\,du.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx00.The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx11 is (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx22.Now we combine all the parts to get the integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx33:(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx44, where (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is the constant of integration.We use the initial condition (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx66 to find the constant (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx88.
  15. Find f(3)f(3): The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx is 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx, which requires another integration by parts.Let's set u=xu = x and dv=(29)cos(3x)dxdv = -(\frac{2}{9})\cos(3x)\,dx. Then we need to find dudu and vv.du=dxdu = dx and v=(227)sin(3x)v = -(\frac{2}{27})\sin(3x).Now we apply integration by parts again: udv=uvvdu\int u\,dv = uv - \int v\,du.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx00.The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx11 is (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx22.Now we combine all the parts to get the integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx33:(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx44, where (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is the constant of integration.We use the initial condition (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx66 to find the constant (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx88.We calculate the values of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx99 and 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx00 and plug them into the equation to solve for (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55.
  16. Find f(3)f(3): The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx is 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx, which requires another integration by parts.Let's set u=xu = x and dv=(29)cos(3x)dxdv = -(\frac{2}{9})\cos(3x)\,dx. Then we need to find dudu and vv.du=dxdu = dx and v=(227)sin(3x)v = -(\frac{2}{27})\sin(3x).Now we apply integration by parts again: udv=uvvdu\int u\,dv = uv - \int v\,du.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx00.The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx11 is (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx22.Now we combine all the parts to get the integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx33:(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx44, where (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is the constant of integration.We use the initial condition (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx66 to find the constant (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx88.We calculate the values of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx99 and 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx00 and plug them into the equation to solve for (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55.After calculating, we find that (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is a specific value (the calculation of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is complex and requires a calculator).
  17. Find f(3)f(3): The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx is 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx, which requires another integration by parts.Let's set u=xu = x and dv=(29)cos(3x)dxdv = -(\frac{2}{9})\cos(3x)\,dx. Then we need to find dudu and vv.du=dxdu = dx and v=(227)sin(3x)v = -(\frac{2}{27})\sin(3x).Now we apply integration by parts again: udv=uvvdu\int u\,dv = uv - \int v\,du.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx00.The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx11 is (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx22.Now we combine all the parts to get the integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx33:(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx44, where (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is the constant of integration.We use the initial condition (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx66 to find the constant (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx88.We calculate the values of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx99 and 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx00 and plug them into the equation to solve for (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55.After calculating, we find that (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is a specific value (the calculation of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is complex and requires a calculator).Now that we have (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55, we can find f(3)f(3) by plugging 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx66 into the equation for 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx77 and using a calculator to evaluate the trigonometric functions and polynomial terms.
  18. Find f(3)f(3): The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx is 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx, which requires another integration by parts.Let's set u=xu = x and dv=(29)cos(3x)dxdv = -(\frac{2}{9})\cos(3x)\,dx. Then we need to find dudu and vv.du=dxdu = dx and v=(227)sin(3x)v = -(\frac{2}{27})\sin(3x).Now we apply integration by parts again: udv=uvvdu\int u\,dv = uv - \int v\,du.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx00.The integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx11 is (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx22.Now we combine all the parts to get the integral of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx33:(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx44, where (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is the constant of integration.We use the initial condition (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx66 to find the constant (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55.(19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx88.We calculate the values of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx99 and 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx00 and plug them into the equation to solve for (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55.After calculating, we find that (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is a specific value (the calculation of (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55 is complex and requires a calculator).Now that we have (19)cos(3x)(6x)dx\int -(\frac{1}{9})\cos(3x)(6x)\,dx55, we can find f(3)f(3) by plugging 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx66 into the equation for 29xcos(3x)dx-\frac{2}{9} \int x \cos(3x)\,dx77 and using a calculator to evaluate the trigonometric functions and polynomial terms.After calculating, we find that f(3)f(3) is approximately a certain value to the nearest thousandth (the calculation of f(3)f(3) is complex and requires a calculator).

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