$x^2-x+7$
$y=e^{7x+1}$
$\lim_{x\to+\infty}\left(1-\frac{1}{x^2}\right)^x$
$\left(5-xy\right)^3$
$\int\left(\frac{x^2+1}{x^2-1}\right)dx$
$\lim_{x\to-\infty}\left(\frac{2x^5+3x^7}{2x^8}\right)$
$-8+\log2\left(4x\right)=-4$
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