Question Number 76522 by john santu last updated on 28/Dec/19
$${sir}\:{what}'{s}\:{difference}\:\frac{{d}}{{da}}\:{with}\:\frac{\partial}{\partial{a}}\:?\: \\ $$
Commented by mr W last updated on 28/Dec/19
$${if}\:{the}\:{function}\:{has}\:{only}\:{one} \\ $$$${variable},\:{then}\:\frac{{df}\left({x}\right)}{{dx}}. \\ $$$${if}\:{the}\:{function}\:{has}\:{two}\:{or}\:{more} \\ $$$${variables},\:{then}\:\frac{\partial{f}\left({x},{y}\right)}{\partial{x}},\:\frac{\partial{f}\left({x},{y}\right)}{\partial{y}}. \\ $$