$9^8\cdot9^{-5}$
$\left(2c-7f\right)\left(2c+7f\right)$
$681-315$
$\frac{a^{20}}{a^{-7}}$
$4-10p+25p^2$
$\lim_{x\to0}\frac{e^xsen2^x-1}{\ln\left(1+2x\right)}$
$\lim_{x\to0}\left(1+\frac{2.9}{x}\right)^x$
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