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

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in Trigonometry by (53.7k points)

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

(a) 2sin2α

(b) 4

(c) 4sin2α

(d) –4sin2α

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1 Answer

+1 vote
by (53.5k points)

Correct option is (c) 4sin2α

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