Find the difference between two sets, namely ${0, -\frac{15}{\sqrt{\pi }}, -7, -6, 6.96, -4} \setminus {6.96, -6, -7}$.

import math

fst = set((0, -(15/(math.sqrt(math.pi))), -7, -6, 6.96, -4,))
snd = set((6.96, -6, -7,))
print(fst - snd)
