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+1 vote
2.7k views
in Trigonometry by (41.7k points)

cos[2tan-1(1/7)] equals

(A) sin(4cot-13)

(B) sin(3cot-14)

(C) cos(3cot-14)

(D) cos(4cot-13)

1 Answer

+1 vote
by (41.4k points)
selected by
 
Best answer

Correct option (A) sin(4cot-13)

Explanation:

We have

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