$\int y^2\cos\left(y\right)dx$
$\frac{dy}{dx}=4\cdot y^2+12\cdot y+9$
$x^2\frac{dy}{dx}=\sec y$
$\left(a\cos\left(x\right)+b\right)^2$
$-3+\frac{6}{3}$
$\frac{x^2-4}{x^2+4}$
$x^2+6x-27$
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