$234,43+56,7+23,145$
$\left(a^m+b^h\right)\left(a^m-b^h\right)$
$\int sec\:3t\:\left(tan3t\right)dt$
$\lim_{x\to0}\left(\frac{\log\left(1+3x\right)}{\sqrt{x+4}-2}\right)$
$-x^2+13x-42$
$2-\left(-16\right)$
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