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If x sin theta+y sin 2 theta+z sin 3 the...

If `x sin theta+y sin 2 theta+z sin 3 theta=sin 4 theta, (theta pi n pi)` then `8cos^(3)theta-4z cos^(2)theta-2(y+2)cos theta` is equal to

A

`x-y`

B

`x-z`

C

`y-z`

D

none of these

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The correct Answer is:
b
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