Q. If $y = 2 tan^{- 1} (\frac{x - a}{b - x})^{\frac{1}{2}} ($ where $a < x < b)$ then $(x - a) (x - b) (\frac{d y}{d x})^{2}$ has the value equal to

66 101 Continuity and Differentiability Report Error

A

1

B

-1

C

$\frac{1}{2}$

D

4

Solution:

Correct answer is (b) -1