advanced functions - drwls, Sunday, November 8, 2009 at 10:59am
Rewrite the right side, using
cos (x + y) = cos x cos y - sin x sin y
cos (x - y) = cos x cos y + sin x sin y
You should be familiar with those two identities.
advanced functions - nando, Wednesday, October 15, 2014 at 6:53pm
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