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What's this result of equation solving?

Hi guys

I want to solve an equation that get from determinant of a matrix, but I cannot understand the result! Can anyone help me?

It's my code:

x = var('x')
A = Matrix([[0,1],[1,0]])
A = (I*x*A).exp()
A = A.determinant()
solve(A == 1,x,to_poly_solve ='force')

This is result!!!!!:

[x == 1/2*I*lambert_w(68)]

What is exactly that c68 (it's change every time!) [The result for equation should be pi/2]