If cosx + cos2x = 1,the numerical value of (sin12 + 3sin10x + 3sin8x + sin6x

Question

If cosx + cos2x = 1,the numerical value of (sin12 + 3sin10x + 3sin8x + sin6x - 1) = ?

Options:

A . -1

B . 2

C . 0

D . 1

Answer: Option C

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