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July 31, 2015

Homework Help: Trigonometry - Identities and proof

Posted by Sam on Wednesday, November 13, 2013 at 11:23am.

Show that cot((x+y)/2) = - (sin x - sin y)/(cos x - cos y) for all values of x and y for which both sides are defined.

I tried manipulating both sides in terms of trig identities but I don't really have a solution....help would be appreciated, thanks.

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