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17 November, 02:02

What is sin theta when cos theta is 0

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  1. 17 November, 02:24
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    Divide by costheta

    You get Sin (theta) / Cos (theta) + Cos (theta) / cos (theta) = 0

    [Sinx/cosx = tanx (a law of trigs) ]

    so the same as tan (theta) + 1=0

    So tan (theta) = -1

    Inverse tan/arctan (-1) = 3/4 pi and (2pi - 3/4pi) = 7/4pi
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