# 1.) Find the solution set of 2sin squared ??-1= 0 if 180 degrees is less than or equal ?? less

1.) Find the solution set of 2sin squared ??-1= 0 if 180 degrees is less than or equal ?? less than or equal 360 degrees2.) prove:2 cot ??/cot squared ?? -1 = sin2 ?? sec2 ??