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import math print(math.erf(.25)) ''' run: 0.2763263901682369 '''
import math print(1.0 + math.erf(0.25 / math.sqrt(2.0)) / 2.0) ''' run: 1.0987063256829237 '''
import math print(math.erf(-0.25)) ''' run: -0.2763263901682369 '''