Question Number 42787 by maxmathsup by imad last updated on 02/Sep/18
$${find}\:{lim}_{{x}\rightarrow\mathrm{0}} \:\:\:\:\frac{\mathrm{1}}{\left({sinx}\right)^{\mathrm{4}} }\left\{\:{sin}\left(\frac{{x}}{\mathrm{1}−{x}}\right)−\frac{{sinx}}{\mathrm{1}−{sinx}}\right\} \\ $$