Find the values of the following trigonometric ratios:
Given 
⇒ -sin 330° = -sin (90° × 3 + 60°)
330° lies in the fourth quadrant in which the sine function is negative.
∴ sin (-330)° = -sin (90° × 3 + 60°)
= - (-cos 60°)
= - (-1/2)
= 1/2
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