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Prove that the area of the parallelogram...

Prove that the area of the parallelogram formed by the lines `3x-4y+a=0,\ 3x-4y+3a=0,\ 4x-3y-a=0\` a n d \4x-3y-2a ` `=0\ ` i s `(2a^2)/7s qdotu n i t sdot`

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