Solve this: 13. If y = t e n - 1 1 + x 2 + 1 - x 2 1 + x 2 - 1 - x 2 , x 2 ≤ 1 , t h e n f i n d d y / d x . Share with your friends Share 0 Neha Sethi answered this Dear student Note:1) cos2x=2cos2x-12) tan(A+B)=tanA+tanA1-tanA tanB Regards 0 View Full Answer