$sen^2teta-2senteta+2$
$2x^2-mx-4m-n=mx^2+mx+yx+4y$
$\frac{x^5+2x^3-3}{x-1}$
$\left(c-2\right)^2$
$8x\ge-32$
$\lim_{x\to\infty}ln\left(\frac{x-e^{2x}}{a+e^{4x}}\right)$
$\frac{1}{5x^2+10x+85}$
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