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Math Help - solve w/o calc inverse of tan -1 and for sin,cos

  1. #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. #2
    Eater of Worlds
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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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