answersLogoWhite

0


Best Answer

cos(120 = -0.5

User Avatar

Wiki User

12y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: What is cos 120?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

What is the cosine of 120 degrees?

Cos(120) = -0.5


What is quadrantal angle?

A Quadrantal angle is an angle that is not in Quadrant I. Consider angle 120. You want to find cos(120) . 120 lies in quadrant II. Also, 120=180-60. So, it is enough to find cos(60) and put the proper sign. cos(60)=1/2. Cosine is negative in quadrant II, Therefore, cos(120) = -1/2.


What is a quadrantal angle?

A Quadrantal angle is an angle that is not in Quadrant I. Consider angle 120. You want to find cos(120) . 120 lies in quadrant II. Also, 120=180-60. So, it is enough to find cos(60) and put the proper sign. cos(60)=1/2. Cosine is negative in quadrant II, Therefore, cos(120) = -1/2.


Why is cosign always positive?

cos(180°) = -1, so it is not always positive.


What is the exact value of cos 120?

negative one half


Give the six trigonometric function of 120?

sin(-120)=sqrt(3)/2 cos(-120)=-1/2 tan(-120)=-sqrt(3) csc(-120)=2/sqrt(3) sec(-120)=-2 cot(-120)=-1/sqrt(3)


Given sin theta equals 7 over 13 and tan theta is less than 0 find tan theta?

sin(t) = 7/13 cos2(t) = 1 - sin2(t) = (169 - 49)/169 = 120/169 so cos(t) = ±sqrt(120)/13. But sin(t) > 0, tan(t) < 0 implies t is in the second quadrant so cos(t) = -sqrt(120)/13 And then tan(t) = sin(t)/cos(t) = -7/sqrt(120) = -0.6390 (approx).


During a takeoff in still air an airplane moves at a speed of 120 mih at an angle of 25 above the ground What is the ground speed of the plane?

cos 25 = groud speed/120 ground speed = 108.76 mi/h


What are the solutions of 2 cos squared x minus cos x equals 1?

2cos2x - cosx -1 = 0 Factor: (2cosx + 1)(cosx - 1) = 0 cosx = {-.5, 1} x = {...0, 120, 240, 360,...} degrees


What is cos square?

Cos times Cos


Is cos squared x the same as cos x squared?

No. Cos squared x is not the same as cos x squared. Cos squared x means cos (x) times cos (x) Cos x squared means cos (x squared)


Cos plus cos plus cos?

3cos