Q. 41

Mark (√) against A.

B.

C.

D. none of these

Answer :



cos y=2x2 -1


y=cos-1 (2x2 -1)


Put x = cos θ


y = cos-1( 2 cos2 θ – 1)


y = cos -1( cos 2 θ )


y = 2θ


But θ = cos-1x.





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