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7 May, 20:13

Proof cot a/2 = 1+cos a/sin a?

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  1. 7 May, 20:36
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    See below.

    Step-by-step explanation:

    tan a/2 = sin a / (1 + cos a)

    cot a/2 = 1 / tan a/2

    = 1 / sin a / (1 + cos a)

    = (1 + cos a) / sin a.
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