सिध्द कीजिए कि `(4x + 2y)^(3)-(4x-2y)^(3)=16y^(3)+192x^(2)y` 
सिध्द कीजिए कि `(4x + 2y)^(3)-(4x-2y)^(3)=16y^(3)+192x^(2)y` 
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