Question: If sin 3A = cos (A + 10), where 3A is an acute angle, then what is the value of 2 cosec (3A/2) + 6

If sin 3A = cos (A + 10°), where 3A is an acute angle, then what is the value of 2 cosec (3A/2) + 6 sin2 3A – (3/2) tan2 3A?

(A) 4

(B) 7/4

(C) 5

(D) 17/2

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