input: Write a python function to calculate the given mathematical expression and return the result.
  assert calculate_expression(10)==12.0
  assert calculate_expression(6)==9.797958971132712
  assert calculate_expression(0)==2.8284271247461903
output: def calculate_expression(x):
      import math
      return (x**2 + 2)**0.5 + math.sin(x)