$li\lim_{x\to1}\frac{\sqrt{x}-1}{\sqrt{x+3}-2}$
$x+y=55$
$\int e^{5x}\left(2x-1\right)dx$
$\lim_{x\to-1}\left(\frac{25-x^2}{x^2-4x-5}\right)$
$\int\frac{4x+2}{x+1}dx$
$\frac{2x^2-7x}{x-8}$
$\left(x'\right)$
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