Find the values of the trignometric ratios:
cosec(-1200)
sin(-330

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Solution

$\cos e c (- 1200) = \cos e c (- 1080 - 120) = \cos e c (2 π (- 3) - \frac{2 π}{3}) = \cos e c (- \frac{2 π}{3}) = - \cos e c (\frac{2 π}{3}) = - \cos e c (\frac{π}{2} + \frac{π}{6}) = - s e c \frac{π}{6} = \frac{- 2}{\sqrt{3}}$
$\sin (- 330) = - \sin 330 = - \sin (360 - 30) = - (- \sin 30) = \sin 30 = \frac{1}{2}$

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