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Questions  

Cos2Tan1SinCot1x=

a
x2+1x2+2
b
x2−1x2+2
c
x2+1x2−2
d
x2−1x2+1

detailed solution

Correct option is A

We haveCot−1x=Sin−111+x2andTan−1x=Cos−111+x2∴cos2tan-1sincot-1x=cos2tan-111+x2                                                 =11+11+x222                                                 =x2+1x2+2

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