If |z1|le1,|z2|le1"show that" |1-z1z2|^2...

If `|z_1|le1,|z_2|le1"show that"`
`|1-z_1z_2|^2-|z_1-z_2|^2=(1-|z_1|^2)(1-|z_2|^2`
"Hence or otherwise show that."
`|(z_1-z_2)/(1-z_1z_2)|lt 1"if"|z_1| lt 1,|z_2| lt 1`

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