$\lim_{x\to\infty}\left(\frac{x^2-sen\left(x\right)}{x^2}\right)$
$3x+15=3\left(x+5\right)$
$-75-\left(-25\right)$
$3y^{2}-12y-7=0$
$96\cdot3.5$
$8a^3-b^3$
$\tan\left(x\right)-\frac{1}{\cos\left(x\right)}^2$
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