Question Number 56331 by maxmathsup by imad last updated on 14/Mar/19
$${calculate}\:{lim}_{{x}\rightarrow\mathrm{0}} \:\:\:\:\:\frac{{ch}\left({cosx}\right)−{cos}\left({chx}\right)}{{x}^{\mathrm{2}} } \\ $$
calculate-lim-x-0-ch-cosx-cos-chx-x-2-