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Q)

$\frac{\sin (-660^{\circ}) \tan (1050^{\circ}) \sec(-420^{\circ} )}{\cos(225^{\circ}) \mathrm{cosec} (315^{\circ}) \cos (510^{\circ})}$ is equal to:


( A ) $\frac{\sqrt 3}{4}$
( B ) $\frac{\sqrt 3}{2}$
( C ) $\frac{2}{\sqrt 3}$
( D ) $\frac{4}{\sqrt 3}$

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