def points(n):
x, y = 1, 0
yield x, y
angle = 2 * pi / n
for _ in range(n):
x, y = (
x * cos_a - y * sin_a,
x * sin_a + y * cos_a
)
yield x, y
for x, y in points(8):
print('{:.3f} {:.3f}'.format(x, y))
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