$\frac{2x-1}{x-3}\le1$

$\lim_{x\to\infty}\left(\frac{1+sen\left(x\right)}{x}\right)$

$\lim_{x\to\infty}\left(\sqrt{x^2+9}-x\right)$

$\int\frac{1}{\left(x^2+49\right)^5}dx$

$\frac{d^2}{dx^2}\left(f''\left(x\right)=4x^2+5x-12\right)$

$\frac{-15x-4}{8}\le8x-\left(-8\right)$

$\left(9x+5y\right)+\left(3x+7y\right)$