1.(sin 30°)²+(cos 30°)²=1 2.cot(-660°)=√3/3
3.If cot ∅<0, and cos ∅<0,then ∅ lies in quadrant III
4.sin 45° cos 45° - cos 45° sin 45° = 0
5.Cos-300°=-1/2

ALL I NEED TO KNOW IS IF EACH ONE IS TRUE OR FALSE ASAP PLZZZ