$\lim_{x\to0}\left(\frac{senx-x}{x}\right)^{\frac{senx}{x-senx}}$
$\int\left(\frac{1}{\sqrt{1-9x^2}}\right)dx$
$\left(\frac{28}{15}\right)\left(\frac{5x}{7y}\right)$
$5a^2-3ab+2ab^2$
$\left(\left(-2\right)^3\right)^3$
$\frac{x^4}{x^3}+\frac{x^2}{x^2}$
$a^3-a+a^2\cdot a-1$
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