SIN= the opposite side is better than the hypotenuse.
COS= the ratio of adjacent side to hypotenuse.
sin 30 = 1/2 cos 30 =√3/2 tan 30 =√3/3
sin 60 =√3/2 cos 60 = 1/2 tan 60 =√3
sin45=cos45=√2/2 tan45= 1
Sin90 = 1cos90 = 0tan90 is meaningless.
sin0=0 cos0= 1 tan0=0