$\int sen^2\left(7x-2\right)dx$
$3u\cdot3u$
$\int\frac{12x-20}{x^2-2x-15}dx$
$\sqrt{48}-\sqrt{27}$
$\left(+2\right)\cdot\left(-7\right)-8\cdot\left(-4\right)-\left(-5\right)\cdot\left(-2\right)$
$x\:-\:3x^2\:+4x\:-3x^2$
$\frac{3x^3+4x^2+5x-1}{x^2+2}$
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