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misal : u = 3x² - 4x + 5
du / dx = 6x - 4
du / dx = 2 (3x - 2)
(3x - 2) dx = 1/2 du
soal menjadi :
∫ (3x - 2) √(3x² - 4x + 5 dx = 1/2 du .√u
= 1/2.√u du
= 1/2 (u)^1/2 du
= (1/2) / (3/2) u^(3/2) + c
= (1/3) .u .u^(1/2) + c
= (1/3) .u .√u + c
= (1/3)(3x² - 4x + 5)√(3x² - 4x + 5) + c
jawaban : d