1.

If `y = tan^(-1)[(sqrt(1+x)-sqrt(1-x))/(sqrt(1+x)+sqrt(1-x))]` then prove that `dy/dx = 1/(2 sqrt(1-x^2))`

Answer» `sec^(-1)theta=cos^(-1).(1)/(theta)and cos^(-1)theta+sin^(-1)theta=(pi)/(2).`


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