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integral should not be zero

F = sqrt((cos(x) - 1)^2 + sin(x)^2)
F.integrate(x, 0, 2*pi)

yields 0, the expected answer is 8.

integral should not be zero

F = sqrt((cos(x) - 1)^2 + sin(x)^2)
F.integrate(x, 0, 2*pi)

yields 0, the expected answer is 8.