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सिद्ध कीजिए - `|(-a^2,ab,ac),(ba,-b^2,bc),(ac,bc,-c^2)|=4a^2b^2c^2`

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L.H.S`=|(-a^2,ab,ac),(ba,-b^2,bc),(ac,bc,-c^2)|`
`=abc|(-a,b,c),(a,-b,c),(a,b,-c)|`
(`R_1,R_2` और `R_3` से क्रमशः a,b,c उभयनिष्ट लेने पर )
`=a^2b^2c^2|(-1,1,1),(1,-1,1),(1,1,-1)|`
(`C_1,C_2`और `C_3` से क्रमशः a,b,c उभयनिष्ट लेने पर )
`=a^2b^2c^2|(-1,0,0),(1,0,2),(1,2,0)|`
( संक्रियाओं `C_2toC_2+C_1,C_2toC_3+C_1` से )
`=a^2b^2c^2xx(-1)xx|(0,2),(2,0)|`
(`R_1` के सापेक्ष प्रसार करने पर )
`=a^2b^2c^2(-1)(0-4)`
`=4a^2b^2c^2`.

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