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7 April, 12:38

If cos theta=-√3/2 and 90°< theta<180°, then theta=?

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  1. 7 April, 12:55
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    First, cos30 = sqrt3/2

    Also, - cosx=cos (180-x)

    Therefore

    cos150=cos (180-30) = - cos30=-sqrt3/2

    Hence theta is 150
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