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$$\cot (-840^{\circ}) + \cosec (330^{\circ}) + \sec (1020^{\circ}) - \sin (-1320^{\circ}) =$$
$$\frac{1}{2\sqrt{3}}$$
$$2\sqrt{3}$$
$$ -2\sqrt{3}$$
$$\frac{-1}{2\sqrt{3}}$$
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