Easy way of memorizing values of sine, cosine, and tangent My math professor recently told us that she wanted us to be able to answer $\sin\left(\frac{\pi }{2}\right)$ in our head on the snap. I know I can simply memorize the table for the test by this Friday, but I may likely forget them after the test. So is there a trick or pattern you guys usually use to remember it? For example, SOHCAHTOA tells us what sine, cosine, and tangent really mean.

If not, I will just memorize the table. But just wanted to know what memorization techniques you guys use. I feel this is the perfect place to ask, because I bet a bunch of people in the math stackexchange, also had to go through the same thing freshman year of college.
Oh here is a picture of the unit circle:


This method worked good for me, you need to remember two triangles.
Let the first be a equilateral triangle with all sides of length 2, you divide the triangle in two by joining the top vertex (easy to see that way), with the centre of side of the opposite one, now you have a triangle with sides as of length 1 and $\sqrt3$ and hypotenuse of 2, one angle is 30 and other is 60.
Other is make a right angled  isosceles triangle with sides 1,1 and $\sqrt2$, with this you lookup 45 and 90. 
I used to make these small drawings at a place easy to lookup like last paper of answer sheet and just check them whenever needed.  
