This question was asked in Ex 12.2, 5
๐‘‡โ„Ž๐‘’ ๐‘๐‘กโ„Ž ,๐‘ž๐‘กโ„Ž ๐‘Ž๐‘›๐‘‘ ๐‘Ÿ๐‘กโ„Ž ๐‘ก๐‘’๐‘  ๐‘œ๐‘“ ๐‘Ž๐‘› ๐ด.๐‘ ๐‘Ž๐‘Ÿ๐‘’ ๐‘Ž,๐‘ ๐‘Ž๐‘›๐‘‘ ๐‘ ๐‘Ÿ๐‘’๐‘ ๐‘๐‘’๐‘๐‘ก๐‘–๐‘ฃ๐‘’๐‘™๐‘ฆ ๐‘ โ„Ž๐‘œ๐‘ค ๐‘กโ„Ž๐‘Ž๐‘ก ๐‘Ž(๐‘ž-๐‘Ÿ) ๐‘(๐‘Ÿ-๐‘) (๐‘-๐‘ž)=0

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