How do you find the exact value of expression: cos ((8pi)/3)?
1 Answer
Jun 23, 2018
Explanation:
cos((8pi)/3)
=cos((8pi)/3-2pi)
=cos((2pi)/3)=-cos(pi/3)=-1/2
cos((8pi)/3)
=cos((8pi)/3-2pi)
=cos((2pi)/3)=-cos(pi/3)=-1/2