1. sin135=sin(90+45)=cos45=√2/2
2. cos210=cos(180+30)=-cos30= -√3/2
3. sin300=sin(270+30)= -cos30= -√3/2
4. sin240=sin(180+60)=-sin60= -√3/2
5. tg315=tg(360-45)=-tg45= -1
6. sin(-120)=-sin120= -sin(180-60)= -sin60= -√3/2
7. cos(-150)=cos150=cos(180-30)= -cos30= -√3/2
8. cos(2π/3)=cos(π - π/3)= -cos(π/3)= -1/2
9. tg(5π/6)=tg(π - π/6)= -tg(π/6)= -1/√3
10. sinπ=0
11. cos3.5π=cos(4π - π/2)=cos(π/2)=0
12. tg(5π/4)=tg(π+π/4)=tg(π/4)=1
13. cos(5π/3)=cos(2π - π/3)=cos(π/3)=1/2
14. sin(10π/3)=sin(3π + π/3)= -sin(π/3)= -√3/2
15. cos(-960)=cos960=cos(2*360+180+60)=cos(180+60)=
=-cos60= -1/2
16. tg750=tg(2*360+30)=tg30=1/√3
17. ctg1110=ctg(3*360+30)=ctg30=√3
18. sin(-13π/3)=-sin(13π/3)=-sin(4π+π/3)=-sin(π/3)=-√3/2
19. ctg(-13π/6)=-ctg(13π/6)=-ctg(2π+π/6)=-ctg(π/6)=-√3
20. cos(-29π/4)=cos(29π/4)=cos(7π+π/4)=-cos(π/4)=-√2/2