SOLUTION: what is the exact value of cos120 degreees?
Algebra.Com
Question 197033: what is the exact value of cos120 degreees?
Answer by anantha(86) (Show Source): You can put this solution on YOUR website!
sol:
cos120=cos(180-60)
=-cos(60) (i.e;cos(180-thita)= -cos(thita))
=- 1/2 (cos60=1/2)
=-0.5
RELATED QUESTIONS
Find the exact value of the expression... (answered by stanbon)
What is the exact value of tan345* (answered by Edwin McCravy)
What is the exact value of... (answered by hovuquocan1997)
What is the exact value of... (answered by lwsshak3)
What is the exact value of tan15* ? (answered by ikleyn)
Cos120°=
(answered by Cromlix)
What is the exact value of the tan of... (answered by lwsshak3)
If angle A is 14 degreees, what is angle H and... (answered by Alan3354)
What is the exact value of sine of 13pie/12... (answered by lwsshak3)