let f(x.y)=[x^2 +xy,x^2 −y^2 ] prove from defination of derivative that : Df


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Question Number 130884 by LYKA last updated on 30/Jan/21

$l e t f (x . y) = [x^{2} + x y, x^{2} - y^{2}]$ $p r o v e f r o m d e f i n a t i o n o f$ $d e r i v a t i v e t h a t :$ ${D f}_{(x, y)} (1, 2) = [4 x + y, - 2 x + 4 y]$
Commented by LYKA last updated on 30/Jan/21

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