$\frac{d}{dx}\frac{1+sen\:x}{1-sen\:x}$
$2x^2-7x=4$
$20y^22$
$w-4+7$
$\frac{h^6}{h^{-11}h}$
$x^4+18+81$
$\int\frac{1}{\left(x-1\right)^2\left(x+4\right)}dx$
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