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(x+1)(x³-x²+x-1) = x⁴ - x³ + x² - x + x³ - x² + x - 1 + x⁴- 1
x4-1
b
(x+1)(x³-x²+x-1) = x4-x3+x2-x+x3-x2+x-1=x4-1
b)wychodzi to samo