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January 31, 2015

January 31, 2015

Posted by **Anonymous** on Tuesday, May 31, 2011 at 8:01pm.

----- + -----

sec x-1 sec x+1

- trig -
**Reiny**, Tuesday, May 31, 2011 at 8:46pmis that

cosx/(secx - 1) + cosx/(secx + 1) ???

of so, then using a common denominator , ...

(cosx(secx + 1) + cosx(secx - 1)) / (sec^2 x - 1)

= cosx(2secx)/tan^2x

= cosx(2/cosx) ( cos^2x/sin^2x

= 2cot^2 x

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