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pakai parsial
misal: u = ln x
du = 1/x dx
dv = x dx
v = (1/2)x²
int x ln x dx = (ln x)(1/2)x² - int (1/2)x² (1/x) dx
= (1/2) (ln x)x² - (1/2) int x dx
= (1/2)x² (ln x) - (1/4)x² + c