Science

Math

Humanities

... and beyond

Socratic Meta
Featured Answers

Topics

How do you evaluate $cos(7/6 pi)$ ?

1 Answer

A. S. Adikesavan

Apr 22, 2016

$- cos(pi/6)=-sqrt 3/2$ .

Explanation:

Cosine in the third quadrant is negative. $cos (pi + theta ) = -cos theta$ .

Here, $cos ((7pi)/6)=cos(pi+pi/6)=-cos pi/6=-sqrt 3/2$ .

Related questions

See all questions in Trigonometric Functions of Any Angle

Impact of this question

9130 views around the world

You can reuse this answer
Creative Commons License