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Math Help - Critical Numbers of Trig Functions

  1. #1
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    Critical Numbers of Trig Functions

    Im having a difficult time figuring out what to do when asked to find critical numbers of trig functions.

    I understand question such as number (1) in my picture, but im stumped at questions like (2).

    Do i have to simply cos(x)-sin(x) using trig identities? Or do i just set cos(x)=0 and -sin(x)=0 and solve?

    Any idea what i should review in my trig books to understand these questions better?

    Thanks for the help.
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Critical Numbers of Trig Functions

    For what angles do you have sin(x) = cos(x)?
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  3. #3
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    Re: Critical Numbers of Trig Functions

    pi/4 and 5pi/4!! lol.. i see. its pretty clear now that you put it that way.

    Thanks so much!
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