$-\cos\left(x\right)=\cos\left(-x\right)$
$\frac{x^3+2x+1}{x+1}$
$\frac{dy}{dx}=e^{\left(x+2y\right)}$
$2senx\:-\:1\:=\:0$
$g^2-4^2$
$a+b+a^2+b+a^3+b$
$\int\left(\frac{10}{x-1}+\frac{32x-71}{x^2+9}\right)dx$
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