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प्रश्न
Find the value of k if for the complex numbers z1 and z2, `|1 - barz_1z_2|^2 - |z_1 - z_2|^2 = k(1 - |z_1|^2)(1 - |"z"_2|^2)`
उत्तर
L.H.S. = `|1 - barz_1z_2|^2 - |z_1 - z_2|^2`
= `(1 - barz_1z_2) (bar(1 - barz_1 z_2)) - (z_1 - z_2) (bar(z_1 - z_2))`
= `(1 - barz_1 z_2) (1 - z_1 barz_2) - (z_1 - z_2)(barz_1 - barz_2)`
= `1 + z_1 barz_1 z_2barz_2 - z_1barz_1 - z_2barz_2`
= `1 + |z-1|^2 * |z_2|^2 - |z_1|^2 - |z_2|^2`
= `(1 - |z_1|^2)(1 - |z_2|^2)`
R.H.S. = `k(1 - |z_1|^2)(1 - |z_2|^2)`
⇒ k = 1
Hence, equating L.H.S. and R.H.S., we get k = 1.
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