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 .

Dear student


Note:1) cos2x=2cos2x-12) tan(A+B)=tanA+tanA1-tanA tanB


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