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(3x² -1) ²-9x²( 1-x) ² = 9x^4 - 6x^2 + 1 - 9x^2(1 - 2x + x^2) =
9x^4 - 6x^2 + 1 - 9x^2 + 18x^3 - 9x^4 =
18x^3 - 15x^2 + 1
daj na naj plis!
9x^4 - 6x^2 + 1 - 9x^2 + 18x^3 - 9x^4 =
18x^3 - 15x^2 + 1