यदि [If]|z| = 1, साबित कीजिये कि (...

यदि ` [If]|z| = 1, ` साबित कीजिये कि (prove that ) ` ( z - 1 ) /( z + 1 ) ( z ne - 1 ) ` एक विशुद्ध अवास्तविक संख्या है z =1 ?

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