Răspuns:
R
Explicație pas cu pas:
sin 120=sin(180-60)=√3/2
sin135=sin(180-45)=√2/2
sin150=sin(180-30)=1/2
cos120=cos(180-60)=-1/2
cos135=cos(180-45)=-√2/2
cos150=cos(180-30)=-√3/2
tg120=tg (180-60)=-√3
tg135=tg (180-45)=-1
ctg120=ctg (180-60)=-√3/3
ctg135=ctg (180-45)=-1
ctg150=ctg(180-30)=-√3