$9^2.\frac{27^{-4}}{81^{-2}}.3^{-5}$
$\frac{\left(3x+4\right)\left(3x-4\right)}{2}$
$\int_0^{\infty}\left(\frac{senx}{x^4}\right)dx$
$ydy-7dx+8y^2dy-dx=0$
$\left(6e-6p\right)\left(2e-9p\right)$
$a^2+a^2-2a^2$
$\frac{\sin\left(a\right)\cos\left(a\right)}{\cos\left(a\right)\left(\sin\left(a\right)-\sin\left(a\right)\cos\left(a\right)\right)}$
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