... = с³-4³х³ = с³-(4х)³ = (с-4х)(с²+с•4х+(4х)²) = (с-4х)•(с²+4сх+16х²)
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... = с³-4³х³ = с³-(4х)³ = (с-4х)(с²+с•4х+(4х)²) = (с-4х)•(с²+4сх+16х²)