Here's what they taught you in a standard trig class:

radians	degrees	sin	cos	tan
0	0	0	1	0
π/6	30	1 / 2	√3 / 2	1 / √3
π/4	45	1 / √2	1 / √2	1
π/3	60	√3 / 2	1 / 2	√3
π/2	90	1	0	∞

Here's what they didn't teach you, but this definitely comes in handy sometimes, especially if you are dealing with pentagons, octagons, or dodecagons:

radians	degrees	sin	cos	tan
π/12	15	(√6 – √2) / 4	(√6 + √2) / 4	2 – √3
π/10	18	(√5 – 1) / 4	√(10 + 2√5) / 4	√(1 – 2/√5)
π/8	22.5	(2 – √2) / 2	(2 + √2) / 2	√2 – 1
π/5	36	√(10 – 2√5) / 4	(√5 + 1) / 4	√(5 – 2√5)
3π/10	54	(√5 + 1) / 4	√(10 – 2√5) / 4	√(1 + 2/√5)
3π/8	67.5	(2 + √2) / 2	(2 – √2) / 2	√2 + 1
2π/5	72	√(10 + 2√5) / 4	(√5 – 1) / 4	√(5 + 2√5)
5π/12	75	(√6 + √2) / 4	(√6 – √2) / 4	2 + √3