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prove trig identities solver

Asked Jun 29, 2012, 04:28 AM — 1 Answer

Prove cos^4 x - sin^4 x = cos 2x

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ebaines Posts: 10,033, Reputation: 5529

Expert

Jun 29, 2012, 06:50 AM

Note that the equation is the difference of two squares - so you can factor it. After that see if what you get looks like an identity for cos2x.

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