Sub Equation in for a Letter in Grasshopper

Is there an easy way to sub an equation in for a letter in grasshopper?

Say I have an equation that is:

Panel:

1/2*(A^2+B^2+C^2)*(A^2+B^2+C^2)-(A^2+B^2+C^2)-(A^2+B^2+C^2)

Where:
A=sin(x)*sin(y)
B=cos(x)*cos(y)
C=cos(y)

I’d like to be able to do something along the lines of “find and replace” the A and replace it with the sin(x)*sin(y)

you can use Math → Script → Expression or Evaluate

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