Question: code class = asciimath > B i 8 . Ch ng minh r ng h m f ( z ) = { ( ( x

code class="asciimath">Bi 8. Chng minh rng hm f(z)={((x^(3)-y^(3))/(x^(2)+y^(2))+i(x^(3)+y^(3))/(x^(2)+y^(2)),, nu z!=0),(0,, nu z=0):}, khng co hm ti im z_(0)=0.
code class = "asciimath" > B i 8 . Ch ng minh r

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