Question

Find the value of cos -3
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Answer 1

Step-by-step explanation:

Negative sign indicates that angle is clockwise means

it is downward to positive x axis.

So it is in 4th quardent..

and in 4th quardent cosx and secx are positive..

hence

$\cos( - 30) = \cos(30) = \frac{ \sqrt{3} }{2}$

Thank you.

Answer 2

Answer:

The value of cos-30 is under root 3/2

The root is only 3