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du = 12x² dx ---> dx = du/ 12x²
= ∫ 4x² (u)⁷. du/ 12x² ... coret x², 4 dan 12
= ∫ u⁷/3 du
= ¹/₃ ∫ u⁷ du
= ¹/₃. ¹/₈ u⁸ + c
= ¹/₂₄ u⁸ + c
= ¹/₂₄ (4x³+1)⁸ + c