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January 30, 2015

January 30, 2015

Posted by **Anonymous** on Sunday, April 7, 2013 at 10:58am.

Give your answers as exact values, as a list separated by commas.

- Precalculus -
**Reiny**, Sunday, April 7, 2013 at 11:10amcosine is negative in II or III

and I know cos 60° = cosØ/3 = 1/2

so for your cosØ = -1/2

Ø = 180-60 =120° or Ø = 180+60 = 240°

in radians

Ø = 2π/3 or Ø = 4π/3

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