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(2a-b-b+2a)(2a-b+b-2a)
= 4a . 0
= 1
semoga membantu :)
(b-2a)2=b2-4ab+4a2
4a2-4ab-b2-(b2-4ab+4a2)
=4a2-4ab-b2-b2+4ab-4a2
=-2b2
(Minus dua b pangkat dua)