sin90°=y/r=r/r=1 cos90°=x/r=0/r=0
cot90°=x/y=0/r=0 csc90°=y/r=r/r=1
sin180°=y/r=0/r=0 cos180°=x/r=-r/r=-1
tan180°=y/x=0/-r=0 sec180°=r/x=r/-r=-1
sin360°=y/r=0/r=0 cos360°=x/r=r/r=1
tan360°=y/x=0/r=0 sec360°=r/x=r/r=1
sin90°=y/r=r/r=1 cos90°=x/r=0/r=0
cot90°=x/y=0/r=0 csc90°=y/r=r/r=1
sin180°=y/r=0/r=0 cos180°=x/r=-r/r=-1
tan180°=y/x=0/-r=0 sec180°=r/x=r/-r=-1
sin360°=y/r=0/r=0 cos360°=x/r=r/r=1
tan360°=y/x=0/r=0 sec360°=r/x=r/r=1