#1 cos x+sec x=2

Question

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

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


please show all work & thanks

Answer 1

cos 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