What is the exact value of $cos - 330$ $cos -330$ ?

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Answer 1 · 2015-07-05T04:58:46

Find cos (-330)

On the trig unit circle:

cos (-330) = cos (30 - 360) = cos 30

Trig table gives -> $cos 30 = \frac{\sqrt{3}}{2}$ $cos 30 = (sqrt3)/2$

$cos (- 330) = \frac{\sqrt{3}}{2}$ $cos (-330) = (sqrt3)/2$

What is the exact value of cos−330cos -330?