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Mathematics, 16.06.2021 06:10 JessTaylr04

1. If AC and BD are the diagonals of a parallelogram ABCD show that AC? +BD = 2(AB + AD'). b AC?-BD = 4 AB - AD. by vector method:​

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1. If AC and BD are the diagonals of a parallelogram ABCD show that AC? +BD = 2(AB + AD'). b AC?-BD...

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