In the triangle ABC, C = 90 degrees, a = 75 degrees, CD is vertical to AB, and the perpendicular foot is D, what is the value of CD / AB

In the triangle ABC, C = 90 degrees, a = 75 degrees, CD is vertical to AB, and the perpendicular foot is D, what is the value of CD / AB

The midpoint on AB is e, connecting CE
According to the title condition, CE = 1 / 2Ab, while in the RT triangle CED, the angle Dec = 15 + 15 = 30
So CD = 1 / 2ce = 1 / 4AB
CD/AB=1/4