$\lim_{x\to\pi}\left(\frac{\cos\left(x\right)}{1-sin\left(x\right)}\right)$
$\left(3m+4n-5\right)^2$
$-3+2\cdot4$
$y'=x^2-3x^2y$
$\int_2^{\infty}\left(\frac{1}{\sqrt{2+x}}\right)dx$
$-x^2-4x+1$
$\frac{x^3+6x^2-4x+19}{x-3}$
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