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Question: if f(x)=x cos x, find f"(x), or d2ydx2 Physics Calculus Differentiation Solution: Using the Product Rule, we have f'(x)=xddx(cos x)+cos xddx(x)=-xsinx+cosx To find f"(x) we differentiate f'(x): f"(x)=ddx(-x sin x+cos x)=-xddx(sin x)+sin x ddx(-x)+ddx(cos x) =-x cos x-sin x-sin x = -x cos x-2 sin x my problem is : I didn't understand how to solve this question |
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Answer» Question: if f(x)=x cos x, find f"(x), or d2ydx2 Physics Calculus Differentiation Solution: Using the Product Rule, we have f'(x)=xddx(cos x)+cos xddx(x)=-xsinx+cosx my problem is : I didn't understand how to solve this question |
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