$h=3x^{4}-4x^{4}-15x^{4}+12^{x}$
$\frac{3}{27^3}^{11}$
$f\left(x\right)=\left(x-1\right)\left(x+1\right)^2$
$3\left(2x+5\right)+2x-3$
$\lim_{x\to2}\left(\frac{4^x-16}{2^x-4}\right)$
$4x^2+81+36$
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