, so you require . This occurs at , in this case .

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- Nov 25th 2009, 02:03 PM #1

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## Where does sin(x^2+1)=0

I am given the function with the derivative f '(x)=sin(x^2+1). I need to find out how many relative extrema exist in the interval 2<x<4. To do this I know that I first need to find where the derivative is equal to 0. However I don't know where sin(x^2+1)=0 (and how prove it does at these points)

- Nov 25th 2009, 02:13 PM #2

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- Nov 25th 2009, 02:14 PM #3

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