InterviewSolution
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InterviewSolution
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Prove that`|2alpha+beta+gamma+deltaalphabeta+gammadeltaalpha+beta+gamma+delta2(alpha+beta)(gamma+delta)alphabeta(gamma+delta)+gammadelta(alpha+beta)alphabeta+gammadeltaalphabeta(gamma+delta)+gammadelta(alpha+beta)2alphabetagammadelta|=0` |
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Answer» consider the product `|{:(1,,1,,0),(alpha+beta,,gamma+delta,,0),(alphabeta,,gammadelta,,0):}|xx |{:(1,,1,,0),(gamma+delta,,alpha+beta,,0),(gammadelta,,alphabeta,,0):}|` `= |{:(2,,alpha+beta+gamma+delta,,gammadelta+alphabeta),(alpha+beta+gamma+delta,,2(alpha+beta)(gamma+delta),,alphabeta(gamma+delta)+gammadelta(alpha+beta)),(alphabeta+gammadelta,,alphabeta(gamma+delta)+gammadelta(alpha+beta),,2alphabetagammadelta):}|` `=Delta` hence `Delta=0` [being the product of two determinants each equal to0] |
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