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If sintheta+sin2theta+sin3theta=sinalpha...

If `sintheta+sin2theta+sin3theta=sinalpha` and `costheta+cos2theta+cos3theta=cosalpha`, then `theta` is equal to

A

1) `alpha/2`

B

2) `alpha`

C

3) `2alpha`

D

4) `alpha/6`

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