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d/dx (e^x cosy + x^2 - y^2 + 3x) -i d/dy (e^x cosy + x^2 - y^2 + 3x), y=0, x=z
d/dx (e^x cosy + x^2 - y^2 + 3x) -i d/dy (e^x cosy + x^2 - y^2 + 3x), y=0, x=z
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