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  4. If y=2 tan -1((x-a/b-x))(1/2)( where a<x<b) then (x-a)(x-b)((d y/d x))2 has the value equal to

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Q. If $y=2 \tan ^{-1}\left(\frac{x-a}{b-x}\right)^{\frac{1}{2}}($ where $a
Continuity and Differentiability

Solution:

Correct answer is (b) -1