$7^3\cdot7^2\cdot7^3$
$\sqrt{-243}$
$\lim_{x\to0}\:\left(cos\left(1-\frac{sen\:x}{x}\right)\right)$
$\int_0^1x^3e^{-5x}dx$
$\int6x^2e^{6x^3}dx$
$\frac{2x}{-3y}\cdot\frac{-2x+4}{5y-2}$
$\left(-1+a\right)^2$
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