a) \(A=4x^2-4x+1-8x^2+24x-18+4=-4x^2+20x-13\)
b) \(B=\left(3x+2\right)^2+2\left(3x+2\right)\left(1-2y\right)+\left(1-2y\right)^2=\left(3x+2+1-2y\right)^2\)
\(=\left(3x-2y+3\right)^2=9x^2+4y^2+9-12xy+18x-12y\)
c) \(C=\left(x^2+2xy+y^2\right)^2=x^4+6x^2y^2+y^4+4x^3y+4xy^3\)
d) \(=\left(x-1+x\right)^3=\left(2x-1\right)^3=8x^3-12x+6x-1\)