Question

Please help in solving this

Answer 1

III a ) sin(8.90+60).cos(4.90+30)+ (-(sin(300)))cos330
sin60.cos30+(-(sin(3.90+30)).cos(3.90+60)
√3/2.√3/2+(-(-(√3/2.√3/2)))
3/4-(-3/4)
3/4+3/4
6/4=3/2