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Complex Z / (1 + Z2) If the complex Z satisfies | Z | = 1, Z ≠ ± I, then Z / (1 + Z2) is () A real number B pure imaginary number C real number or pure imaginary number d imaginary number but not pure imaginary number
z=e^(iθ),θ≠(k+1/2)π
z/(1+z2)=1/[e^(iθ)+e^(-iθ)]=1/(2cosθ)
A real number
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- 12. 0〈a
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