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p(x+y) +q(x-y) =p^(2) -pq +q^(2) और p(x...

`p(x+y) +q(x-y) =p^(2) -pq +q^(2)` और ` p(x+y) -q (x-y) =p^(2) +pq +q^(2)` जहां p ,q शून्य से भिन्न अचर है

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