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Math Help - Find tan from sin.

  1. #1
    arm
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    Find tan from sin.

    Let sin \alpha =\frac{-1}{4}, \pi  < \alpha  < \frac{3\pi }{2}.
    Find: tan(\alpha -\frac{25\pi }{4})
    Last edited by mr fantastic; February 26th 2011 at 01:52 PM. Reason: Re-titled.
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  2. #2
    MHF Contributor
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    Quote Originally Posted by arm View Post
    Let sin \alpha =\frac{-1}{4}, \pi  < \alpha  < \frac{3\pi }{2}.
    Find: tan(\alpha -\frac{25\pi }{4})
    draw a reference triangle in quad III, use the given \sin{\alpha} = -\dfrac{1}{4} to determine the value of \cos{\alpha} , then use the ratio identity to find \tan{\alpha} , finally use the difference identity for tangent to finish.

    btw ... you need to be sharing what you've attempted on all those other posts.
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