$-5x^3+4x^2+5x-4$
$\log x-3\log y+\log1$
$x^2+14x+9$
$\lim_{x\to0}\left(\frac{\ln\left(x\right)}{\cot\left(gx\right)}\right)$
$\int\frac{\left(3x+8\right)}{9+7x^2}dx$
$\frac{\sen^{4}x-\cos^{4}x}{\sen^{2}x-\cos^{2}x}$
$\frac{6x^5-2x^4-10x^2-2x-12}{3x^2-x+3}$
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