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Rikkard
Answers (1)
1/cos^2A -sin^2A + 2cosAsinA/cos^2A -sin^2A = 1+2cosAsinA/cos^2A -sin^2A I used the trig identies to expand 1/cos2A and sin2A/cos2A and added the together because they have the same denominator. How I got from 1 to cos^2+sin^2 is by trig identity
