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In [1]: import math
import math
In [2]: def sphera_vol(r): return 4/3*math.pi*r**3
def sphera_vol(r): return 4/3*math.pi*r**3
In [3]: sphera_vol(5)
sphera_vol(5)
Out[3]: 523.5987755982989
523.5987755982989
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