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Math Help - [SOLVED] Critical points

  1. #1
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    [SOLVED] Critical points

    if you solve f '(x)=(2sinx)(cosx)=0 ; how do you get that x=0
    in case your wondering i am using the first derivative test and this is already the derivative of the original function which was f(x)=sin^2x
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  2. #2
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    Quote Originally Posted by vinson24 View Post
    if you solve f '(x)=(2sinx)(cosx)=0 ; how do you get that x=0
    in case your wondering i am using the first derivative test and this is already the derivative of the original function which was f(x)=sin^2x
    not exactly sure what you mean ...

    are you asking why f'(x) = 0, or are you asking how to solve 2\sin{x}\cos{x} = 0 ?
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  3. #3
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    im asking how to solve the equation (2sinx)(cosx)=0 so that you get x=0 as a critical point
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  4. #4
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    You have either sin(x) = 0 or cos(x) = 0 so you know that x = 0 or x = Pi/2
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