Вычислить значение выражения: 1)sin 135 градусов 2)cos 210 3)sin 300 4)sin 245 5)tg 315 6)sin(-120) 7)cos(-150) 8)cos 2п/3 9)tg 5п/6
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1)sin 135⁰=sin(90+45)=sin(π/2+45)=cos 45=√2/22)cos 210=cos(180+30)=cos(π+30)=-cos 30=-√3/2
3)sin 300=sin(360-60)=sin(2π-60)=-sin 60=-√3/2
4)sin 245=sin(270-25)=sin(3π/2-25)=-cos 25≈-0.9
5)tg 315=tg (360-45)=tg(2π-45)=-tg45=-1
6) sin(-120)=-sin(180-60)=-sin(π-60)=-sin 60=-√3/2
7)cos(-150)=cos 150=cos(180-30)=-cos30=-√3/2
8)cos 2п/3=cos (π-π/3)=-cos π/3=-1/2
9)tg 5п/6=tg(π-π/6)=-tg π/6=-√3/3