sin300=sin(360-60)=-sin60=√3/2
tg315=tg(360-45)=-tg45= -1
cos210=c0s(180+30)=-cos30=-√3/2
tg(-225)=-tg225=-tg(180+45)=-tg45=-1
sin240=sin(180+60)=-sin60=-√3/2
ctg150=ctg(180-30)=-ctg30=-√3
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Answers & Comments
sin300=sin(360-60)=-sin60=√3/2
tg315=tg(360-45)=-tg45= -1
cos210=c0s(180+30)=-cos30=-√3/2
tg(-225)=-tg225=-tg(180+45)=-tg45=-1
sin240=sin(180+60)=-sin60=-√3/2
ctg150=ctg(180-30)=-ctg30=-√3