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Math Help - Solving trigonmetric equations

  1. #1
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    Solving trigonmetric equations

    For \frac{\pi}{2}<x<\pi with \cos x = -\sin \frac{\pi}{6} , find the value of x.

    The question also states to not evualate the value of \sin \frac{\pi}{6}

    How do I do this question?
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  2. #2
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    Quote Originally Posted by user_5 View Post
    For \frac{\pi}{2}<x<\pi with \cos x = -\sin \frac{\pi}{6} , find the value of x.

    The question also states to not evualate the value of \sin \frac{\pi}{6}

    How do I do this question?
    Dear user_5,

    Use the trignometric identity, cos\left(\frac{\pi}{2}+A\right)=-sinA

    Hope this will help you.
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