(3x+2)(3x-2)(9x²+4)=
=(9x²-4)(9x²+4)=
=81x^4-16
(6c²-2/7)(6c²+2/7)(36c^4+4/49)=
=(36c^4-4/49)(36c^4+4/49)=
=1296c^8-16/2401
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(3x+2)(3x-2)(9x²+4)=
=(9x²-4)(9x²+4)=
=81x^4-16
(6c²-2/7)(6c²+2/7)(36c^4+4/49)=
=(36c^4-4/49)(36c^4+4/49)=
=1296c^8-16/2401