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Math Help - find values of sine, cosine etc of angle

  1. #1
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    find values of sine, cosine etc of angle

    without using calculator, find the values of sine, cosine, tangent, cotangent of the following angle:

     <br />
\frac{3\pi}{4}<br />

    any help much appreciated
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  2. #2
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    Quote Originally Posted by jvignacio View Post
    without using calculator, find the values of sine, cosine, tangent, cotangent of the following angle:

     <br />
\frac{3\pi}{4}<br />

    any help much appreciated
    Always Remember this
    sin(\pi-x) = sin(x)

    cos(\pi-x)= -cos(x)

    tan(\pi-x)= -tan(x)

    cot(x) = \frac{1}{tan(x)}

    Here x= \pi/4
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