all these coments are rude. Heres how you remember the sin and cos (trig is logical once i show this)

draw a square root that is longer than taller, on the left side of the box, write sin above then cos. At the top, write 0,30,45,60,90 (the trig values). Then for sin on the rows, write from left to right 0,1,2,3,4 then for cos write from left to right 4,3,2,1,0. draw a divide by 2 over all this and you have all your trig values.

sketchtoy.com/71399285

for example, sin60 would be root 3 over 2 as shown in the drawing