$\left(2x+y+z\right)\left(2x-z\right)$
$4\left(ax^2-b\right)^4$
$6x^2+x\left(x-13\right)=18$
$\lim\:_{x\to\:0}\left(\:\frac{\left(e^{2x}-e^{-2x}-2x\right)}{x\:-\:sen\left(x\right)}\right)\:$
$3x^2+12x+12$
$x^2-9x+24$
$f\left(x\right)=\ln\left(x^3+8^4\right)$
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