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Question Number 24151 by Nayon.Sm last updated on 13/Nov/17
$${y}={f}\left({t}\right)\:{and}\:{y}''={ksiny}\:{y}=? \\ $$
Commented by Nayon.Sm last updated on 14/Nov/17
$${mrw}\mathrm{1}\:{ans}\overset{} {\:} \\ $$