In the square ABCD, there is a point E, △ EAB is an equilateral triangle, ∠ CED = several degrees

Let the side length of the square be 1, ∠ CED = X
tan(x/2)=1/2 / (1-3^0.5/2)=2+3^0.5
tanx=-3^0.5/3
X = 150 degrees

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