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[" If "(z-alpha)/(z+alpha)(alpha in R)" ...

[" If "(z-alpha)/(z+alpha)(alpha in R)" is a purely imaginary number and "|z|=2" ,then value of "alpha" is: "],[qquad [" (1) "1," [JEE-MAIN ONLINE-2019] "," (4) "(1)/(2)]]

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