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If y=cos^2[tan^(-1)(sin[cot^(-1)x])], th...

If `y=cos^2[tan^(-1)(sin[cot^(-1)x])],` then `(dy)/(dx)` is (a)`(-2x)/((x^2+2)^2)` (b) `(2x)/((x^2+2)^2)` (c)`2/((x^2+2)^2)` (d) `(-2)/((x^2+2)^2)`

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