$\frac{3x^3+x^2-5x+4}{x-1}$
$\lim_{x\to0}\frac{\left(3+h\right)^2-9}{x}$
$\frac{\cos\left(90^{\circ}-a\right)}{\sena}$
$6x-8=2\cdot\left(x+4\right)$
$x-6\sqrt{x^2}+5x-66$
$\left(a+2x\right)\left(2x-3a\right)$
$\frac{m^3+125}{w+3}$
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