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asked ago in Trigonometry by (7.1k points)

If cos cos-1(x/2), + cos-1(y/3) = θ then 9x2 - 12xy cosθ + 4y2 is equal to

(A) 36sin2θ

(B) 36cos2θ

(C) 36tan2θ

(D) None of these

1 Answer

+1 vote
answered ago by (6.9k points)
selected ago by
Best answer

Correct option (A) 36sin2θ


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