Which trigonometric expressions equal - 1/2 ? Check all that apply.

-cos(120°)
-sin (7pie/6)
-sin(–120°)
-cos(7pie/6)
-COS (-10pie/3)

Which trigonometric expressions equal 12 Check all that apply cos120 sin 7pie6 sin120 cos7pie6 COS 10pie3 class=