$\left(k^2+l^2\right)e^{\frac{k}{l}}$
$4\cdot\sen^{2}x-1=0$
$2\left(x^2-4x+6\right)-3x\left(x+7\right)$
$5^{2x}+5^x=0$
$\left(-2\right)^1.\left(-2\right)^3.\left(-2\right)^4$
$\left(2xy-9\right)^3$
$\int\:x^{-\frac{1}{3}}dx$
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