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If cot (alpha + beta) = 0, then sin (alp...

If `cot (alpha + beta) = 0`, then `sin (alpha + 2 beta)` is equal to

A

(a) `sinalpha`

B

(b) `cosalpha`

C

(c) `sinbeta`

D

(d) `cos2beta`

Text Solution

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The correct Answer is:
A
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