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Q)
If $\theta$ is the angle between the vectors $2 \hat{i} + 2 \hat{j} + 4 \hat{k}$ and $3 \hat{i} + \hat{j} + 2 \hat{k}$, then $\sin \theta$ is equal to :
( A ) $\frac{2}{\sqrt{7}}$
( B ) $\frac{\sqrt{5}}{21}$
( C ) $\frac{2}{7}$
( D ) $\frac{\sqrt{2}}{7}$
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