cos-1 (2r -1)-(A) 2 cos-1x (B) cos(C) 2cos-1/(D) of thes – InterviewSolution

1.

cos-1 (2r -1)-(A) 2 cos-1x (B) cos(C) 2cos-1/(D) of thes

Answer»

Let x=Cos^2t

NowCos^-1(2Cos^2t-1)=

Cos^-1(Cos2t)=2t

=2Cos^-1√x

option c

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