$\int4tan^2\left(x\right)dx$
$\left(7a^4b\right)\left(4a^7b^8\right)$
$\lim_{x\to0}\left(\frac{\sqrt{2}x+1-\sqrt{3}}{x-1}\right)$
$\ln\left(\sqrt[8]{\frac{e^7}{x^4+y}}\right)$
$\frac{w^6-64}{w+2}$
$\lim_{x\to\infty}\left(\frac{sinx}{e^{2x}}\right)$
$x^2+6x\le0$
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