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# If $\theta = \frac{\pi}{6}$, then the $10^{th}$ term of $1 + (\cos \theta + i \sin \theta) +(\cos \theta + i \sin \theta)^2+(\cos \theta + i \sin \theta)^3 + ...$ is equal to :

( A ) $i$
( B ) $-i$
( C ) $-1$
( D ) $1$