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Thread: solve w/o calc inverse of tan -1 and for sin,cos

  1. August 16th 2008, 02:44 PM #1
    apm
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    solve w/o calc inverse of tan -1 and for sin,cos

    how would I solve tan^-1 (-1)
    i also have to do it for sin and cos

    thanks
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  2. August 16th 2008, 03:06 PM #2
    galactus
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    Think about it. If tan(y/x)=1, then y=x

    So, it is a 45 degree angle or Pi/4 radians.
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