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Math Help - trig graphs

  1. #1
    Junior Member
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    trig graphs

    I've already sketched the grpah of y = cosx for 0 <(less than or equal to) x <(less than or equal to) 360 but the problem im having is where it askes me to hence solve negative square root 3 over 2 <(less than or equal to) cosx <(less than or equal to) square root 3 over 2 ==
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  2. #2
    MHF Contributor
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    Re: trig graphs

    So the question is this: for which angles is the following statement true: -\frac{\sqrt{3}}{2} \leq \cos \theta \leq \frac{\sqrt{3}}{2}?

    To answer that, you must first find the angles for which equality holds.
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  3. #3
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    Re: trig graphs

    how do i find the angles for which equality holds?
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  4. #4
    MHF Contributor Siron's Avatar
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    Re: trig graphs

    What is:
    \arccos\left(\frac{-\sqrt{3}}{2}\right)?
    \arccos\left(\frac{\sqrt{3}}{2}\right)?
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