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Q) sin(cot^-1x)+-------
A)1/root(1/x2) B)root(1/x2) C)-1/root(1/x2) D)none
the answer is (d) i guess.
sin(cot^-1(x))
=sin(sin^-1(1/root(1+x^2)))
=1/root(1+x^2)
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