You should memorize the ratio of sides of the
30-60-90 right-angled triangle
the ratio of sides are 1 : √3 : 2 correspondingly, if you forget where the numbers go, remember the smallest side is across the smallest angle, the largest side across the largest angle, etc.
(notice 1^2 + (√3)^2 = 2^2)
You can now form any trig ration of 30 and 60 degrees.
You should also memorize the 45-45-90 triangle
which has sides in the ration of 1:1:√2
to find of trigonometric ratios of angles 60
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