$4x+2-3x-5$
$\lim_{x\to+\infty}\left(\frac{x^2+1}{x^2-1}\right)$
$\int\frac{1}{2senx+1}dx$
$\left(a-x\right)^2=121$
$\left(2u-2g\right)^2$
$\left(4x^4+3\right)^3$
$-12\cdot\left(-34\right)$
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