How do you find the exact value of cos 180degrees - sin 180degrees?

1 Answer
May 25, 2018

#-1#

Explanation:

Within the unit circle, cosine provides the #x# coordinate of a point on the surface of the circle. Sine provides the #y# coordinate of a point on the surface of the circle.

At #180^o#, the point on the unit circle surface is #(-1,0)#. So this means:

#x=cos(180^o) = -1#

#y=sin(180^o) = 0#

To find the exact value of #cos(180^o) -sin(180^o)#

#-1 - 0 = -1#