The derivative of the function f is defined by f′(x)=(x3+3x)cos(2x+5). If f(−3)=−5, then use a calculator to find the value of f(4) to the nearest thousandth.Answer:
Q. The derivative of the function f is defined by f′(x)=(x3+3x)cos(2x+5). If f(−3)=−5, then use a calculator to find the value of f(4) to the nearest thousandth.Answer:
Integrate f′(x) for f(x): To find f(4), we need to integrate the derivative f′(x) to get the original function f(x). The integral of f′(x) will give us f(x) up to a constant C, which we can determine using the given value f(−3)=−5.
Complex Integral Calculation: The integral of f′(x)=(x3+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 to 4.
Numerical Integration Process: Using a calculator with numerical integration capabilities, we input the function (x3+3x)cos(2x+5) and integrate from x=−3 to x=4. This will give us the change in f(x) over this interval.
Calculate f(4): After performing the numerical integration, we obtain a value (let's call it I). To find f(4), we use the fact that f(4)=f(−3)+I. Since we know f(−3)=−5, we can calculate f(4)=−5+I.
Substitute and Solve: We substitute the value of I obtained from the calculator into the equation f(4)=−5+I to find the value of f(4) to the nearest thousandth.
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