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import math

math.cos(x)

#!/usr/bin/python3
import math

print("cos(3) : ", math.cos(3))
print("cos(-3) : ", math.cos(-3))
print("cos(0) : ", math.cos(0))
print("cos(math.pi) : ", math.cos(math.pi))
print("cos(2*math.pi) : ", math.cos(2*math.pi))

cos(3) :  -0.9899924966004454
cos(-3) :  -0.9899924966004454
cos(0) :  1.0
cos(math.pi) :  -1.0
cos(2*math.pi) :  1.0