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import math

math.tan(x)

#!/usr/bin/python3
import math

print("(tan(3) : ", math.tan(3))
print("tan(-3) : ", math.tan(-3))
print("tan(0) : ", math.tan(0))
print("tan(math.pi) : ", math.tan(math.pi))
print("tan(math.pi/2) : ", math.tan(math.pi/2))
print("tan(math.pi/4) : ", math.tan(math.pi/4))

(tan(3) :  -0.1425465430742778
tan(-3) :  0.1425465430742778
tan(0) :  0.0
tan(math.pi) :  -1.2246467991473532e-16
tan(math.pi/2) :  1.633123935319537e+16
tan(math.pi/4) :  0.9999999999999999