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If cos^-1 x - cos^-1 y/2 = α, then 4x^2 -4xy cos α + y^2 is equal to

+2 votes
in JEE by kratos

If cos-1 x - cos-1 y/2 = α, then 4x2 -4xy cos α + y2 is equal to

(a) -4 sin2 α

(b) 4 sin2 α

(c) 4

(d) 2 sin 2 α

1 Answer

+1 vote
by kratos
 
Best answer

The correct option is (b) 4 sin2 α.

Explanation:

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