$\frac{x^4+2}{x^2+x+1}$
$2a-3b+c+2a+a-2b-c$
$\frac{dy}{dx}=7-y$
$\frac{\sin^2\left(a\right)}{\tan^2\left(a\right)}$
$\frac{x^3-6x^2+15}{x-2}$
$\int\frac{1}{7x-3}dx$
$\lim_{x\to infinito}\left(1-\frac{2}{x}\right)^{3x}$
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