How do you find the value of cos 300?

2 Answers
Aug 4, 2016

=0.5

Explanation:

cos300
=0.5

Aug 4, 2016

cos(300^@)=1/2

Explanation:

Imagine the unit circle:

www.mathsisfun.comwww.mathsisfun.com

We know that 300^@ is in the fourth quadrant, where cosine is positive.

300^@ has a reference angle of 60^@, since it is 60^@ away from the x-axis.

Since cos(60^@)=1/2, we know that cos(300^@)=1/2 as well since cos(theta)>0 in the fourth quadrant.