$x^2+2y^2=4x$
$\text{sen}^2a.\left(1+\cot^2a\right)=1$
$\left(6a^2+9b^2\right)^2$
$\frac{dy}{dx}=\frac{7y}{y-5}$
$5x-x^2=x^2+2x-2$
$\left(10x^3-9xy^5\right)\left(10x^3+9xy^5\right)$
$\lim_{x\to\infty}\frac{1}{x^2-4}$
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