$\int\frac{1}{\sec^4\left(x\right)}dx$
$\lim_{x\to\infty}\left(\frac{3n-5}{n}\right)$
$\pi x^2-\pi b^2$
$\frac{2\pi}{2}$
$\int\left(a-bx\right)^2dx$
$y\left(x\right)+c\cdot\frac{dy}{dx}=0$
$y^4+4y^2+4$
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