a) \(=\left(2x+1\right)^2\)
b) \(=\left(5x^2-0,3\right)\left(5x^2+0,3\right)\)
c) \(=\left(x-y-2\right)\left(x-y+2\right)\)
d) \(=\left(3x-2y-2x+3y\right)\left(3x-2y+2x-3y\right)=\left(x+y\right)\left(5x-5y\right)\)
e) \(=\left(x+4\right)\left(x^2-4x+16\right)\)
f) \(=\left(3x-1\right)\left(9x^2+3x+1\right)\)
