How do you evaluate cot(210) ?

Question

How do you evaluate cot(210) ?

1 Answer

Impact of this question

2303 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2015-11-21T09:52:48

We have that

$sin 210 = sin (30 + 180) = - sin 30 = - \frac{1}{2}$ $sin 210 = sin (30 + 180) = -sin 30 = -1/2$
$cos 210 = cos (30 + 180) = - cos 30 = \frac{- \sqrt{3}}{2}$ $cos 210 = cos (30 + 180) = -cos 30 = (-sqrt3)/2$

$cot 210 = \frac{cos 210}{sin 210} = [\frac{- \sqrt{3}}{2}] : (- \frac{1}{2}) = \sqrt{3}$ $cot 210 = cos 210/sin 210 = [(-sqrt3)/2]:(-1/2) = sqrt3$

Science

Math

Humanities

... and beyond

How do you evaluate cot(210) ?

1 Answer

Related questions

Impact of this question