$\frac{d^2}{dx^2}\left(x^2+5\right)^2$
$\int\:\frac{4}{x\sqrt{x^2-4}}dx$
$\int8xsenxdx$
$4x+2x+5x$
$\left(\frac{1}{1+y^2}+\cos\left(x\right)-2xy\right)$
$\int_0^{\frac{\pi}{2}}\left(\sin^2\left(5x\right)\right)dx$
$\frac{d^2}{dx^2}\left(sen\left(x\right)\right)$
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