$4x^2+81+36$
$\int\left(\frac{3x^2+x+4}{x^4+5x^2+2}\right)dx$
$\:2x^2\left(4y-3x\right)$
$a^2-169$
$6x^2+6x-2y$
$\lim_{x\to4}\left(\frac{4x^2-64}{x-4}\right)$
$\lim\:_{x\to\infty\:}\left(\frac{4x-1}{x}\right)$
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