$2x^2-x^2-2x+4$
$tan\frac{x}{2}=-\frac{\sqrt{3}}{3}$
$\left(\frac{\tau}{l}+p\right)\left(\frac{\tau}{l}-p\right)$
$36x^2-60xf+25x^2$
$7x^4-5x^6+3x^3-x^5$
$\left(x+2\right)\left(5x+2\right)$
$\frac{1+cos\left(x\right)}{sen\left(x\right)}$
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