$\int\frac{x}{\sqrt{5-4x-\left(x^2\right)}}dx$
$3sen\theta\:-cos2\theta\:+1=0$
$2x^3+4x^2-x+2\cdot3x^2$
$\left(\sqrt{x}-5\right)^4+3$
$p^2xp^2$
$\int x.e^{-5x}dx$
$\left(-2\right)^2\left|3\right|$
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