# advcalculator.py with sqrt,log and ln functions
import math

def sqrt(x):
   """This function takes square root of a number"""
   return math.sqrt(x)

def log(x):
   """This function returns log of base 10"""
   return math.log(x,10)

def ln(x):
   """This function returns log of base 2"""
   return math.log(x,2)