Question Number 79469 by M±th+et£s last updated on 25/Jan/20
$${Q}.{solve} \\ $$$$−\frac{{d}^{\mathrm{2}} {y}}{{dt}^{\mathrm{2}} }−{coth}\left({t}\right)\frac{{dy}}{{dt}}+\left(\mathrm{20}+\frac{\mathrm{4}}{{sinh}^{\mathrm{2}} \left({t}\right)}\right){y}=\mathrm{0} \\ $$