$-3x>7$
$\left(7x^3-x^2\right)$
$\lim_{x\to\infty}\left(\frac{2x^2-4}{\sqrt{4x^4-5x^2+1}}\right)$
$\int\left(2x^2+4x+1\right)^2dx$
$x+3kx-7x+5x$
$\left(\frac{sen^2\left(b\right)}{cos^2\left(b\right)}\right)-1$
$\frac{d}{dx}2\sqrt{x}-\frac{3}{x}$
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