A) sin(-1350)=-sin(1350)=-sin(3*360+270)=-sin270=1(-1)=1
б)cos(720)=cos(2*360)=cos(0)=1
в) tg(900)=tg(2*360+180)=tg(180)=0
г) ctg(-450)=-ctg(450)=-ctg(360+90)=-ctg(90)=0
д) sin(19π/6)=sin(2π+7π/6)=sin(7π/6)=-sin(π/6)=-0,5
e) cos(11π/2)=cos(2*2π+3π/2)=cos(3π/2)=0
ж) tg(16π/3)=tg(2*2π+4π/3)=tg(4π/3)=tg(π/3)=√3
з) ctg(-4π/3)=-ctg(4π/3)=ctg(π/3)=-√3/3