$\int\frac{x+a}{x^2-49}dx$
$n+4+9+5n$
$3x^2+12x+12$
$\lim_{x\to0}\left(\frac{sin3t}{tan2t}\right)$
$4x^2+x-3x$
$-12\sqrt{4}$
$-8\cdot56$
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