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[" 13If "x^(2)+y^(2)=1," then what is "(...

[" 13If "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) "-2iy]]

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