The derivative of the function f is defined by f′(x)=(x2−x)cos(x). If f(−3)=−6, then use a calculator to find the value of f(6) to the nearest thousandth.Answer:
Q. The derivative of the function f is defined by f′(x)=(x2−x)cos(x). If f(−3)=−6, then use a calculator to find the value of f(6) to the nearest thousandth.Answer:
Integrate f′(x): To find f(6), we need to integrate the derivative f′(x) to get the original function f(x). The integral of f′(x)=(x2−x)cos(x) will give us f(x) up to a constant C.
Use calculator for integration: We integrate f′(x)=(x2−x)cos(x) using integration by parts or a calculator with symbolic integration capabilities. However, since the problem asks us to use a calculator, we will assume the use of a calculator for this step.
Find constant C: After integrating, we get f(x)=∫(x2−x)cos(x)dx+C, where C is the constant of integration. We need to find the value of C using the initial condition f(−3)=−6.
Solve for C: We plug x=−3 into the integrated function to solve for C: f(−3)=∫(−32−(−3))cos(−3)dx+C=−6.
Calculate definite integral: We use the calculator to find the definite integral from −3 to 6 of (x2−x)cos(x)dx. This will give us the change in f(x) from f(−3) to f(6).
Apply Fundamental Theorem of Calculus: We add the result of the definite integral to the initial value f(−3)=−6 to find f(6). This is because the Fundamental Theorem of Calculus tells us that the definite integral from a to b of f′(x)dx is equal to f(b)−f(a).
Find definite integral I: Using the calculator, we find the definite integral from −3 to 6 of (x2−x)cos(x)dx. Let's denote this value as I.
Calculate f(6): We calculate f(6)=f(−3)+I=−6+I.
Round to nearest thousandth: We round the result to the nearest thousandth as the problem asks for the answer in that precision.
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