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September 21, 2014

September 21, 2014

Posted by **parnas** on Wednesday, January 20, 2010 at 11:57am.

- trig -
**Reiny**, Wednesday, January 20, 2010 at 12:17pmmultiply top and bottom of the left side by

(sinA + cosA + 1) and expand carefully

remember sin^2A + cos^2A = 1

and in the bottom replace the

-cos^2A with (1-sin^2A)

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