Those don't work for me! I'm using Sympy 1.0 with Python 2.7.12.
>>> solveset(sin(x)-sqrt(2)/2, x, Interval(-2*pi, 2*pi))
⎧ 3⋅π ⎫ ⎧ π ⎫
⎨2⋅n⋅π + ─── | n ∊ ℤ⎬ ∪ ⎨2⋅n⋅π + ─ | n ∊ ℤ⎬
⎩ 4 ⎭ ⎩ 4 ⎭
>>> solveset(sin(x)-sqrt(2)/2, x).intersect(Interval(-2*pi, 2*pi))
⎛ ⎧ 3⋅π ⎫⎞ ⎛ ⎧ π
⎜[-2⋅π, 2⋅π] ∩ ⎨2⋅n⋅π + ─── | n ∊ ℤ⎬⎟ ∪ ⎜[-2⋅π, 2⋅π] ∩ ⎨2⋅n⋅π + ─ |
⎝ ⎩ 4 ⎭⎠ ⎝ ⎩ 4
⎫⎞
n ∊ ℤ⎬⎟
⎭⎠
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