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April 19, 2014

April 19, 2014

Posted by **Anonymous** on Monday, May 7, 2012 at 8:01pm.

(1-2Sin^2 X)^2 + 4sin^2 X Cos^2 X

I'm not sure how to start this or which identities to use. Any suggestions?

- Trig -
**Reiny**, Monday, May 7, 2012 at 8:19pm(1-2Sin^2 X)^2 + 4sin^2 X Cos^2 X

(sin^2 x + cos^2 x - 2sin^2 x)^2 + (2sinxcosx)^2

= (cos^2x - sin^2x)^2 + (sin 2x)^2

= (cos 2x)^2 + (sin 2x)^2

= 1

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