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September 19, 2014

September 19, 2014

Posted by **Jerry** on Tuesday, November 13, 2012 at 9:46am.

sin^4theta - cos^4theta = sin^2theta-cose^2theta

- Trig Identity -
**Reiny**, Tuesday, November 13, 2012 at 10:10amLS = sin^4 Ø - cos^4 Ø

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

= (1)(sin^2 Ø - cos^2 Ø)

= RS

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