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Question Number 133400 by Engr_Jidda last updated on 21/Feb/21
$${fine}\:{the}\:{solution}\:{of}\:{the}\:{differential} \\ $$ $${equation}\:{y}^{\mathrm{2}} +\mathrm{9}{y}=\mathrm{9}{sec}^{\mathrm{2}} \mathrm{3}{x},\:\mathrm{0}<{x}<\frac{\pi}{\mathrm{2}} \\ $$