Partial Derivative and Second Derivative Test for Multivariable Extrema

[@tibrummichael2715]

EXCELLENT LECTURE.GOD BLESS YOU SIR

[@MarieWahid]

Awesome

[@MathematicsTutor]

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[@PoppinBichy]

Thank you very much

[@learnwithfaisal4147]

Thanks for the information....

[@aadhyarajput2404]

thank you so much

[@mohammedbabagran1901]

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[@HashemAljifri515]

Can you make double integral tutorial?

[@louishee9059]

Hi can I know how to get fxy = 0?