Science

Math

Humanities

... and beyond

Socratic Meta
Featured Answers

Topics

How do you find the value of $cos 120$ ?

1 Answer

Dec 25, 2016

You can use a reduction formula. See explanation.

Explanation:

$cos120=cos(180-60)=-cos60=-1/2$

Related questions

See all questions in Double Angle Identities

Impact of this question

105649 views around the world

You can reuse this answer
Creative Commons License