Prove the following.
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since a^- b^2 (a+b)(a-b)
so we applied it here
(4x+7y+4x-7y)(4x+7y-4x+7y)
(8x)(14y)
112xy
hence proved
so we applied it here
(4x+7y+4x-7y)(4x+7y-4x+7y)
(8x)(14y)
112xy
hence proved
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