$\left(x^{-0.33\cdot a}\right)^2$
$2xa^2\:\cdot\:\left(-3x^2a\right)\:\cdot\:2$
$+7a^3-7a^3$
$\int_y^{\frac{\pi}{2}}sen^3\left(x\right)cos\left(y\right)dx$
$\int\frac{-30}{x^2\sqrt{x^2+4}}dx$
$4x^2-29x^2+25$
$\int\left(\frac{x+1}{x^3+3x^2-9x-27}\right)dx$
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