$k2\:+\:9k\:+20\:$
$\lim_{x\to2}\left(\frac{4x^2+4x-15}{2x-3}\right)$
$6\left(781\right)$
$\int\sin\frac{4}{x}dx$
$a+b-c-b+2c-a$
$9x^2+5x=3$
$\int_0^v\frac{1}{2.19-0.2v}dv$
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