$\lim_{x\to\infty}\left(\frac{e^{-1+x}-e^{-1}}{x}\right)$
$\int_2^4\left(\sqrt{1+\left(x-3\right)^2}\right)dx$
$8^2:\:2^2$
$x^2+18x+68$
$f\left(-1\right)=3^{-1}$
$\frac{1}{2}\left(sin\left(a+b\right)-sin\left(a-b\right)\right)$
$x^2+y^2-16x=0$
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