і) (4х + Зу)^2- (4х – Зу)^2 – 48xу.
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==> ( 4x + 3y )^2 - (4x - 3y )^2 - 48xy
==> (7xy)^2 - (1xy)^2 - 48xy
==> 49xy - 1xy - 48xy
==> 48 - 48xy
==> xy
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