$\lim_{x\to\infty}\left(\frac{2x^3-2x^2+x-3}{x+8}\right)$
$\left(a^x+7\right)\left(2a^x-14\right)$
$\int10xtanx^2dx$
$x^4+16=0$
$3x+5x-9x+15x-25x-3x$
$\frac{2x+1}{3x-6}\ge3$
$\lim_{x\to1}\frac{12}{lnx}-\frac{9}{4x-4}$
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