$\frac{x^2-x+1}{x-2}$
$1+sen\left(a\right)=3sen\left(a\right)$
$\left(18x-6\right)^{2\:}+\left(6x-2\right)^2$
$\sin x=\frac{\sqrt{7}}{4}$
$\left(x^2-\frac{1}{5}\right)^2$
$\int3x^2\left(x^2+2\right)dx$
$-9\:\left\{5-2-\left[4+3-\left(7+6-9\right)+5\right]\right\}-4$
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