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[" If "x^(2)+y^(2)=1" ,then what is "(1+...

[" If "x^(2)+y^(2)=1" ,then what is "(1+x+" iy ")/(1+x-" iy ")" equal "],[" to? "],[[" (a) "x-" iy "," (b) "x+" iy "," (c) "2x," (d) "-2" iy "]]

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