$\lim_{x\to\infty}\left(\frac{4x^2+5x+2}{1-x^2}\right)$
$8a^4b^{-5}c^6$
$x+2y-1dx-2x+y-5dy=0$
$20xy+19x^2$
$4ax^2-8a^2x+2a$
$\int cot^4\:\frac{x}{6}dx$
$2a^2bc^2;\:a=2;\:b=3;\:c=1$
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