1.

(i) b tan ^(-1)(x/a+tan^(-1)"(x)/a) (ii) (sin ^(-1)x)^(2)-(cos^(-1)x)^2

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ANSWER :`(B(2a^2+x)^2)/(a(a^2+x^2)[1+(x/a +tan^-1""x/a)^2] `
(II) `pi/sqrt(1-x^2)`


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