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= ∫ ((x-1)/x.e²) dx
= (1/e²). ∫ ((x-1)/x dx
misal:
u = x-1
du = 1 dx
dv = 1/x dx
v = ln x dx
(1/e²). ∫ ((x-1)/x dx = (1/e²).[ u.v - ∫ vdu ]
= (1/e²).[ x.ln (x) - ln (x) - ∫ln (x) dx]
= (1/e²).[ x.ln (x) - ln (x) - (x.ln (x) - x + C) ]
= (1/e²).[ x - ln (x) + C ]