1.

cori (2-1) =(A) 2 cos-1x (B) cos1x (C) 2cosx (D)

Answer»

cos^-1(2x-1)

Let x= cos^2A , or cosA=+/-x

=cos^-1(2cos^2A-1)

=cos^-1.cos2A

=2A

=2.cos^-1(X)^1/2 ,hence option c



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