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September 22, 2014

September 22, 2014

Posted by **Anonymus** on Tuesday, March 1, 2011 at 5:23pm.

- Trig -
**agrin04**, Wednesday, March 2, 2011 at 6:25amsec^4(x) - tan^4(x) =

= (1 + tan^2(x))^2 - tan^4(x)

= 1 + 2tan^2(x) + tan^4(x) - tan^4(x)

= 1 + 2tan^2(x)

QED

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