import sympy as sym

# Defining symbols:

x, a = sym.symbols('x, a')

# Defining the function:

f = a*x**2

# Calculating the derivatives:

df_x = sym.diff(f, x, 1)  # First order derivative
ddf_x = sym.diff(f, x, 2)  # Second order derivative
print('df_x =', df_x)
print('ddf_x =', ddf_x)