Question 1025646
Prove, 
tan^2x+2/1+tan^2x=1+cos^2x
(tan^2x+1)/(1+tan^2x) + 1/(1+tan^2) = 1+cos^2x
1 + 1/(1+tan^2) = 1+cos^2
1 + 1/sec^2 = 1 + cos^2
1 + cos^2 = 1 + cos^2