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The derivative of the function 
f is defined by 
f^(')(x)=(x^(3)+3x)cos(2x+5). If 
f(-3)=-5, then use a calculator to find the value of 
f(4) to the nearest thousandth.
Answer:

The derivative of the function f f is defined by f(x)=(x3+3x)cos(2x+5) f^{\prime}(x)=\left(x^{3}+3 x\right) \cos (2 x+5) . If f(3)=5 f(-3)=-5 , then use a calculator to find the value of f(4) f(4) to the nearest thousandth.\newlineAnswer:

Full solution

Q. The derivative of the function f f is defined by f(x)=(x3+3x)cos(2x+5) f^{\prime}(x)=\left(x^{3}+3 x\right) \cos (2 x+5) . If f(3)=5 f(-3)=-5 , then use a calculator to find the value of f(4) f(4) to the nearest thousandth.\newlineAnswer:
  1. Integrate f(x)f'(x) for f(x)f(x): To find f(4)f(4), we need to integrate the derivative f(x)f'(x) to get the original function f(x)f(x). The integral of f(x)f'(x) will give us f(x)f(x) up to a constant CC, which we can determine using the given value f(3)=5f(-3) = -5.
  2. Complex Integral Calculation: The integral of f(x)=(x3+3x)cos(2x+5)f'(x) = (x^3 + 3x)\cos(2x + 5) is not straightforward due to the product of a polynomial and a trigonometric function. We will need to use a numerical method or a calculator to approximate the integral from 3-3 to 44.
  3. Numerical Integration Process: Using a calculator with numerical integration capabilities, we input the function (x3+3x)cos(2x+5)(x^3 + 3x)\cos(2x + 5) and integrate from x=3x = -3 to x=4x = 4. This will give us the change in f(x)f(x) over this interval.
  4. Calculate f(4)f(4): After performing the numerical integration, we obtain a value (let's call it II). To find f(4)f(4), we use the fact that f(4)=f(3)+If(4) = f(-3) + I. Since we know f(3)=5f(-3) = -5, we can calculate f(4)=5+If(4) = -5 + I.
  5. Substitute and Solve: We substitute the value of II obtained from the calculator into the equation f(4)=5+If(4) = -5 + I to find the value of f(4)f(4) to the nearest thousandth.

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