\(\left(2x-1\right)\left(2x+1\right)+4x\left(1-x\right)\)
\(=\left(4x^2-1\right)+\left(4x-4x^2\right)\)
\(=4x^2-1+4x-4x^2\)
\(=\left(4x-1\right)+\left(4x^2-4x^2\right)\)
\(=\left(4x-1\right)+0\)
\(=4x-1\)
(2x-1)(2x+1)+4x(1-x)
=\(4x^2-1\)+ 4x -\(4x^2\)
=4x-1
\(\left(2x-1\right)\left(2x+1\right)+4x\left(1-x\right)\)
\(=4x^2+2x-2x-1+4x-4x^2\)
\(=4x-1\)
(2x-1)(2x+1)+4x(1-x)
=4x^2+2x-2x-1+4x-4x^2
=4x-1