1.

यदि ` 1- i, -2 + 4i ` क्रमशः ` z _ 1 ` और ` z _ 2 ` है तो ` Im ( ( z _ 1 z _ 2 ) /(barz _ 1 )) ` ज्ञात कीजिये |

Answer» ` ( z _ 1 z _ 2 ) /(bar z _ 1) = ( ( 1 - i) ( - 2 + 4i) ) /( 1+i) = ( - 2 + 2i + 4i + 4 ) /( 1 + i) `
`= ((2+6i)(1-i))/( 1 - i^ 2 ) = ( 2 + 6i -2i+6)/( 2 ) = ( 8 + 4i ) /( 2 ) = 4 + 2i `
` therefore Im ( (z _ 1 z _ 2 ) /( bar z _ 1 ) ) = 2`.


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