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let-f-x-y-x-2-xy-x-2-y-2-prove-from-defination-of-derivative-that-Df-x-y-1-2-4x-y-2x-4y-

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Question Number 130884 by LYKA last updated on 30/Jan/21
let f(x.y)=[x^2 +xy,x^2 −y^2 ] prove from defination of derivative that : Df_((x,y)) (1,2)=[4x+y,−2x+4y]
letf(x.y)=[x2+xy,x2−y2]provefromdefinationofderivativethat:Df(x,y)(1,2)=[4x+y,−2x+4y]
Commented by LYKA last updated on 30/Jan/21
okay sir
okaysir

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