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Posted by **O** on Sunday, November 4, 2012 at 1:53pm.

sin^2x = tan^2x/1+tan^2x

sinx+cosx/tanx = 1/cosxtanx

- Math -
**Steve**, Sunday, November 4, 2012 at 2:00pm1+tan^2 = sec^2

so, the Right side is

tan^2/sec^2

= sin^2/cos^2 * cos^2

= sin^2

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