$\lim_{x\to\infty}\left(\frac{e^x-x-1}{cos\left(2x\right)}\right)-1$
$y^4+1+2y^3$
$\int\frac{1}{u^2-a^2}du$
$a^8+36b^2c^2+12a^4bc$
$\left(a+7\right)\left(a-12\right)$
$s^2-4s+3$
$\int\left(\arccsc\left(ax\right)\right)dx$
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