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rumus dari segitiga pascal
a^3-3a^b+3ab^2-b^3
(4)^3 - 3(4)^2(2) + 3(4)(2)^2 - (2)^3
64 - 96 + 48 - 8 = 8
jika dijabarkan (4x-2y) (4x-2y) (4x-2y)