$\int9x^8e^{7x^9}dx$
$y'=lnx^x$
$\cos\left(4x\right)\sin\left(x\right)-\sin\left(4x\right)\cos\left(x\right)$
$\int7x^{2\:}dx$
$3a^2-5a-2$
$5x^2+21x+18=0$
$22+333\cdot11$
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