$x^2y\frac{dy}{dx}=1-x^2+y^2-x^2y^2$
$x^2+x+64$
$-17-18-\left(-35\right)$
$-16x^2+32x+9$
$\frac{6}{a-8}=\frac{-a}{a-4}$
$2a\left(4+a^2\right)$
$\text{cota}\cdot\text{sena}+\cos a$
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