Please give me full solution of questionIs cos threta positive or negative if threta = 500 radians

Please give me full solution of questionIs cos threta positive or nega

1.	Please give me full solution of questionIs cos threta positive or negative if threta = 500 radians
Answer» If threta = 500 radianFirstly change it into degree 500×180 ÷π=28647.88Now cos(28647.88)= -0.88Hence cos threta is negative Please give me the solution because tomorrow is my maths paper