#!/usr/bin/python3
#The asin() method returns the arc sine of x (in radians).
# asin(x)

import math

a = -0.78
b = math.asin(a)
print(b)
print ("asin(0.64) : ", math.asin(0.64))
print ("asin(0) : ", math.asin(0))
print ("asin(-1) : ", math.asin(-1))
print ("asin(1) : ", math.asin(1))
