Question

cos 10П/3+sin150
2sin(7П/2-а)-5cos(17П-а)
-5cos(5П/2+а)+2sin(12П-а)

Answer 1

cos(3π+π/3)+sin(180-30)=-cosπ/3+sin30=-1/2+1/2=0

2sin(2π+(3π/2-a))-5cos(16π+(π-a))=-2cosa+5cosa=3cosa

-5cos(2π+(π/2+a))+2sin(-a)=5sina-2sina=3sina

Answer 2

Спасибо))