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11 November, 05:41

What is the exact value of sin (165) degrees?

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  1. 11 November, 07:50
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    sin 165 = sin (120 + 45) = sin 120 cos 45 + cos 120 sin 45 =

    [sqrt (3) / 2 * sqrt (2) / 2] + (-1/2) (sqrt (2) / 2) =

    [sqrt (6) - sqrt (2) ] / 4
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