@@guywithnoskill That's pretty easy. You have just to learn the cos and sin value on the circle. For that, you can remember to begin at the center of the circle and go to the edge (the direction is not very important you just have to care about if it's negative or positive value) and you write 1, 2, 3. After, you just have to add "/2" under all the values and the "√" on the numerator (not in the 1 because √1 = 1) and tada, you can give all of the cos and sin value !
