$3x+5x^2-x^3+x^4$
$x^2-8x-16\cdot x-2$
$3x^2-27x=0$
$\int\tan^52x\:dx$
$\lim_{x\to\infty}\left(\sqrt{x^2+2ax}-\sqrt{x^2+2bx}\right)$
$log\left(16x\right)+3log\left(x\right)=20$
$\left(-9^2\right)^3$
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