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September 4, 2015

Homework Help: trigonometry

Posted by PDF on Monday, August 27, 2012 at 2:22am.

Verify that following are identities:


1. cos 3t = 4 cosł t-3 cos t

2. sin 4x = 8 sin x cosł x-4 x cos x

(use a double-angle identity)

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