ABCDEF is a regular hexagon. AE and DF intersect at point X. Find the size of angle DXE

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ABCD is a square. Equilateral triangles ABE and ADF are drawn with points E and F either inside or outside the square. Find angle AEF if:

a) E and F are both outside the sqaure
b) E is outside and F is inside the square
c) E and F are both inside the square

Please help me on these questions. Thanks in advance!