$\int\left(\frac{1}{1-x^4}\right)dx$
$21n^{2}+11n-2$
$0,005-0,012$
$\lim_{x\to1}\left(\frac{d-1}{d^2-1}\right)$
$\left(ab+4xy\right)^2$
$2cos^2x-3cosx+1$
$\left(2x\:+\:6\right)\:\left(2x\:-\:9\right)$
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