$\lim_{x\to-9}\left(\frac{x^3-729}{x^2-9x}\right)$
$sin\left(\theta\right)=\frac{0.10}{1.60}$
$-49x^2y^68^{10}-a^{12}$
$\frac{4x}{x-5}+\sin\frac{2}{5-x}$
$a3-5a+1\:entre\:a+2$
$\left(7n-7\right)^2$
$2\left(3\right)^3-6\left(3\right)^2+3$
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