$\int_{-x}^x\left(xy+y-2\right)e^{2x}dy$
$4x^2-12x-11$
$50-5\cdot5\cdot2+3$
$\frac{x^2-5x+6}{x^2-x-2}\cdot\frac{x^2+x-20}{x^2-3x+4}\:$
$\int\:9sen\left(9x\right)cos^7\left(9x\right)dx$
$-\left(2-5\right)+\left(3-7\right)+\left(-4\right)-\left(5-4\right)$
$x^2-7x+5=0$
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