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May 5, 2016
Posted by **Haley** on Tuesday, November 20, 2012 at 3:27pm.

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

#3 cos^2x-sin^2 x+1=cos x

please show all work & thanks

- pre-calc help !!!!!!! -
**Damon**, Tuesday, November 20, 2012 at 3:35pmcos x + 1/cos x = 2

cos^2 x -2 cos x + 1 = 0

(cos x - 1)(cos x - 1) = 0

cos x = 1

x = 0

Now you do some