Sin 720+cos 240+tg 135+ctg 315=

Question

Sin 720+cos 240+tg 135+ctg 315=

Answer 1

sin720=0

cos240=cos(270-30)=-sin30=-0.5

tg135=tg(90+45)=-ctg45=-1

ctg315=ctg(360-45)=-ctg45=-1

0-0.5-1-1=-2.5