calculus and analysis – How to combine long outputs from differentiation in Mathematica?

I have done some calculations that yield long outputs. I would like to name these outputs so they can be called in a later operation. for instance, output 1, is called W, and output 2 is called R, and I do a simple typing of W/R to get a new and long output. How do I do this for the given outputs?

E^(-(1/4) (1 + I Sqrt(15)) x) Sqrt(
x) ( HypergeometricU(3/4 + I/(4 Sqrt(15)), 3/2, 
   1/2 I Sqrt(15) x) + 
  LaguerreL(-(3/4) - I/(4 Sqrt(15)), 1/2, 1/2 I Sqrt(15) x))}}

and

HypergeometricU(3/4 + I/(4*Sqrt(15)), 
3/2, (1/2)*I*Sqrt(15)*
 x)/(E^((1/4)*I*(-I + Sqrt(15))*x)*(2*Sqrt(x))) - ((1/2)*I*
 Sqrt(15)*(3/4 + I/(4*Sqrt(15)))*Sqrt(x)*
 HypergeometricU(7/4 + I/(4*Sqrt(15)), 5/2, (1/2)*I*Sqrt(15)*x))/
  E^((1/4)*I*(-I + Sqrt(15))*x) + ((3/4)*I*Sqrt(15)*Sqrt(x)*
 Sqrt(L(-(3/4) - I/(4*Sqrt(15)))))/   E^((1/4)*I*(-I + Sqrt(15))*x) + ((1/8)*Sqrt(15)*(-I + Sqrt(15))*x^(3/2)*Sqrt(L(-(3/4) - I/(4*Sqrt(15)))))/E^((1/4)*I*(-I + Sqrt(15))*x) - 
((1/4)*I*(-I + Sqrt(15))*Sqrt(x)*Subscript(HypergeometricU(3/4 + I/(4*Sqrt(15)), 3/2, (1/2)*I*Sqrt(15)*x), 1))/E^((1/4)*I*(-I + Sqrt(15))*x)

Any help appreciated!