How do you solve $cos(theta)= -0.6$ over the interval 0 to 2pi?

Question

4633 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-02-25T06:48:51

126.87 deg and 233.13 deg.

When cos is negative the angle is in the second or third quadrant. Use cos (360 deg $-$ $theta$ ) = cos $theta$ .

How do you solve cos(theta)= -0.6cos(theta)= -0.6 over the interval 0 to 2pi?