$\left(x+12\right)\left(x-10\right)$
$10x-7=x+20$
$6x^2=5x\:-1$
$-3x^2+2x^4-8-x^3\:+5x-5x^4$
$\int_0^{\infty}\left(\frac{1}{x+1}\right)dx$
$\lim_{x\to0}\frac{e\left(-x\right)-1}{x}$
$\int\frac{sen^2\left(x\right)-cos^2\left(x\right)}{cos\left(x\right)}dx$
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