$sec^2\left(x\right)-1=sen^2\left(x\right)$
$-6x\left(-6\right)x\left(-6\right)$
$-5\cdot\left(9-5\right)$
$18x^3+63x^2+27x$
$\int\left(\sqrt{x}\left(x+\frac{1}{x}\right)\right)dx$
$\left(7x^6y^4\right)^2$
$x^3-2x^2+2x$
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