$\frac{x^5+x^2-1}{5x^4+2x}$
$\frac{15x^5+21x^2-6}{3x+3}$
$\left(5x+2\right)\cdot\left(5x-2\right)$
$\cos x-\sin^2x-1$
$\frac{3x^4-24x^2+\left(5\right)x-5}{x-3}$
$12\cdot7+6$
$-4z^2\cdot z^2$
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