cos900=cos(360*2+180)=cos180=-1
sin630=sin(360+270)=sin-90=-1
3sin630=-3
tg720=tg(360*2)=tg0=0
3tg720=0
cos900-3sin630+3tg720=-1-(-3)+0=2
cos900=cos(360*2+180)=cos180=-1
sin630=sin(360+270)=sin-90=-1
3sin630=-3
tg720=tg(360*2)=tg0=0
3tg720=0
cos900-3sin630+3tg720=-1-(-3)+0=2