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