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in Trigonometry by (45.0k points)
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If (2n + 1) x = π, then 2n cos x cos 2x cos22 x ….. cos 2n – 1 x =

A. -1

B. 1

C. 1/2

D. None of these

1 Answer

+1 vote
by (47.4k points)
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Best answer

Correct answer is B.

Given (2n – 1) x = π

Then evaluate the expression

2n cos x cos 2x cos22 x ….. cos 2n – 1 x

by taking a 2 from 2n and multiplying and dividing by sin x, we get

These iterations repeat till we reach the last term

So substituting the same in the above solution

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