Find the values of the following trigonometric ratios:
Given 
⇒ cosec (-1200°) = cosec (1200°)
=cosec (90° × 13 + 30)
1200° lies in second quadrant in which cosec function is positive.
∴ cosec (-1200°)= -cosec (90° × 13 + 30°)
= -sec 30°
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