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If tan^-1 (x+h)=tan^-1 (x)+(h sin y)(sin...

If `tan^-1 (x+h)=tan^-1 (x)+(h sin y)(sin y)-(h sin y)^2. (sin^2y)/2+ (h sin y)^3. (sin^3y)/3+…, where xepsilon (0,1), yepsilon (pi/4, pi/2)` then (A) `y=tan^-1x` (B) `y=sin^-1x` (C) `y=cot^-1x` (D) `y=cos^-1x`

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