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Math Help - After solving a trig function to find critical points, how do you test them...

  1. #1
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    After solving a trig function to find critical points, how do you test them...

    to see if its a max/min

    like if I get 2cosx = 0 at pi/2 (so pi/2 would be my critical point)

    do I plug that in back to the original equation? What do I do. Thanks
    Last edited by skinsdomination09; October 13th 2012 at 01:03 PM.
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  2. #2
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    Re: After solving a trig function to find critical points, how do you test them...

    2nd derivative test is easy to do ...
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  3. #3
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    Re: After solving a trig function to find critical points, how do you test them...

    What would I do for that?
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  4. #4
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    Re: After solving a trig function to find critical points, how do you test them...

    To test if a point is a maximum, the function's second derivative will be negative at that point.

    To test if a point is a minimum, the function's second derivative will be positive at that point.

    If the second derivative happens to be 0 at that point, you can't state anything.
    Last edited by Prove It; October 13th 2012 at 05:10 PM.
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