Phân tích thành nhân tử:
a) \(\left(3x-1\right)^2-\left(5x+3\right)^2\)
b) \(\left(2x-y+4z\right)^2-\left(x+y-z\right)^2\)
c) \(\left(x^2+xy\right)^2-\left(x^2-xy-2y^2\right)\)
d) \(x^4-x^2-2x-1\)
e) \(x^2+25+10x-y^2-2y-1\)
f) \(x^2+4y-4xy-z^2+6z-9\)
g) \(x^2-3z\left(3z-2\right)-12xy-1+36y^2\)
h) \(4a^2b^2-\left(a^2+b^2-c^2\right)\)
l) \(x^3+3x^2-9x-27\)
i) \(x^{m+4}+x^{m+3}-x-1\)