Răspuns:
Explicație pas cu pas:
a)sin 120°=sin (180°-60°)=sin 60°=√3/2
cos 120°=cos (180°-60°)=-cos60°=-1/2
tg 120°=-√3
ctg 120°=-√3/3
b) sin 135°=sin (180°-45°)=sin 45°=√2/2
cos135°=cos(180°-45°)=-cosc45°=-√2/2
tg 135°=-1
ctg 135°=-1
c) sin 150°=sin (180°-30°)=sin 30°=1/2
cos 150°=cos(180°-30°)=-cos30°=-√3/2
tg 150°=-√3/3
ctg150°=-√3
d)sin 180°=0
cos180°=-1
tg 180= 0
ctg180° nu are sens nu se poate imparti cu 0
