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Math Help - cosine and sine..

  1. #1
    Newbie
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    cosine and sine..

    Find all angles t, where 0 < or = t < 2pi, that satisfy the given condition.

    a) cost = -1
    b) sint = 1/2

    Find all angles theta (symbol), where 0 < or = theta < 360, that satisfy the given condition.

    a) sin theta = -1/2
    b) cos theta = 1

    I kinda forgot how to find these, any help appreciated. Don't really remember the special triangles if that's what's needed to solve these.. ><.

    Explanations and steps would really help, thanks a lot.
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  2. #2
    Junior Member toraj58's Avatar
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    \sin (\theta) = \sin (2n\pi + \theta)
    \sin (\theta) = \sin ((2n+1)\pi - \theta)
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