Question: Halla: ( a ) d e l z d e l s si z = t a n - 1 ( x 2 + y

Halla:
(a)delzdels si z=tan-1(x2+y2);x=slnt;y=tes
(b)lim(x,y)(0,0)(x2+y2)ln(x2+y2)
Halla: ( a ) d e l z d e l s si z = t a n - 1 ( x

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