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

Simplify: cos x cos x

----- + -----

sec x-1 sec x+1

- trig -
**Reiny**, Tuesday, May 31, 2011 at 8:46pm
is 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

## Answer This Question

## Related Questions

- trig 26 - simplify to a constant or trig func. 1. sec ²u-tan ²u/cos ²v+sin ²v ...
- math - How would you establish this identity: (1+sec(beta))/(sec(beta))=(sin^2(...
- Integration - Intergrate ¡ì sec^3(x) dx could anybody please check this answer. ...
- calculus trigonometric substitution - ∫ dx/ (x^2+9)^2 dx set x = 3tan u dx...
- math - Determine all the possible values of x where 0 deg is more than or equal ...
- trig - how do you start this equation i've been tryng it for 20min. sec^6x(...
- Pre Calculus. - Can someone check my answers please!!! Simplify (tan ^2 theta ...
- Trig - Solve in terms of sine and cosine: sec(x) csc(x)- sec(x) sin(x) so far I ...
- Simplify - Simplify expression tan(-x)csc(x) ??? Cos x -cos x Sin x Sec x -sec ...
- trig - For each expression in column I, choose the expression from column II to ...

More Related Questions