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September 21, 2014

September 21, 2014

Posted by **denise** on Sunday, July 24, 2011 at 9:18pm.

- pre calculus 2 -
**Reiny**, Sunday, July 24, 2011 at 9:52pmtan^4x+2tan^2x+1

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

but we know tan^2x + 1 = sec^2x

so above

= sec^4x

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