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f-z-z-y-xi-z-x-yi-df-dz-

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Question Number 551 by 123456 last updated on 26/Jan/15
f(z)=z(y−xi) z=x+yi (df/dz)=?
f(z)=z(y−xi)z=x+yidfdz=?
Answered by prakash jain last updated on 26/Jan/15
y−xi=−i(x+iy)=−iz z(y−ix)=−iz^2 (df/dz)=−2iz=−2i(x+iy)=2y−i2x
y−xi=−i(x+iy)=−izz(y−ix)=−iz2dfdz=−2iz=−2i(x+iy)=2y−i2x

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