sin30 = 1/2

sin45 =sqrt(2)/2

sin60 =sqrt(3)/2

sin75 =(sqrt(6)+sqrt(2))/4

sin90 = 1

cos 15 =sin75

cos30 =sin60

Cosx = sin (90-x)。 According to this formula, the cosine of other angles can be calculated.

Tanx=sinx/cosx, from which the tangents of other angles can be calculated.

Note: sqrt(x) stands for root number X.