Implementation of Airy's equation and Bessel's equation
Implementation of Airy's equation and Bessel's equation

[1]Airy's equation
Eq(x**2*Derivative(y(x),x,x)-(ax+b)*y(x))
The above equation now has solution c1*Ai(x)+x2*Bi(x)
where Ai(x) and Bi(x) are Airy's functions of first and second order respectively

[2]Bessel's equation
Eq(x**2*Derivative(y(x),x,x)+x*Derivative(y(x),x)+(x**2-n**2)*y(x))
The above equation now has solution c1*besselj(n,x)+c2*bessely(n,x)
where besselj(n,x) and bessely(n,x) are Bessel's functions of first and second order respectively

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