$-x^2-10x+25$
$\lim_{x\to0}\left(\frac{sinx-x+xsinx}{xsinx}\right)$
$\frac{3}{5}m^2-3mn+10m^2-\frac{1}{3}mn+2mn-2m^2$
$\int\frac{e^{3x}-3}{e^{3x}+1}dx$
$\frac{cos\left(90^{\circ\:\:}+x\right)}{sen\left(180^{\circ\:\:\:}-x\right)}$
$\left(5x-3y\right)-x+3x-5y$
$5x-7^2$
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