$2\left(x+3\right)-6$
$\int4.2sen^2\left(1.24\:+\:2x\right)dx$
$\int\frac{1}{x^2\sqrt{4x^2-9}}dx$
$4x^2-2y^3$
$9cos^2x+18cosx+9$
$\int x^3\cdot e^{6x^4+1}dx$
$\lim_{x\to2}\left(\frac{sen\left(\sqrt{x}-\sqrt{2}\right)}{\left(x-2\right)\left(x^3+1\right)}\right)$
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