$\lim_{x\to\infty}\left(\frac{x^2+2x+1}{3x^3+2x^2+x+1}\right)$
$\int\left(3x^3\sqrt{x^4+3}\right)dx$
$2x-8=-2x+12$
$8\log\left(b\right)-q\log\left(d\right)$
$x^2+4^2-45$
$\frac{s^2-2}{s^4-1}$
$\int e^{4x}\left(2x^2-5x+1\right)dx$
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