$\int\log\left(xe^{7x}\right)dx$
$\lim_{x\to4}\left(2x+4\right)^2$
$-12+\left(+10\right)-7+11-\left(-30\right)+\left(-15\right)$
$\tan\left(\frac{\pi}{3}-\frac{\pi}{4}\right)$
$-10x^2-80x-30$
$46+2+\left(-1\right)+2$
$x^3y^{3-8}$
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