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misal:
u = ln² x
du = (2/x).ln (x) dx
dv = dx
v = x
∫ (ln x)² dx = u.v - ∫ v.du
= x.ln² x - ∫ 2.ln x dx
= x.ln² x - 2x.ln x + 2x + C
c. ∫ cot (πx) dx
misal:
u = π.x
du = π dx
(1/π).∫ cot (u) du = (1/π).∫ cos (u)/sin (u) du
= (1/π).∫ 1/sin (u) d(sin u)
= (1/π).ln (sin (u)) + C
= (1/π).ln (sin (π.x)) + C
d. ₀¹∫ xe^(-x²) dx = -(1/2).e^(-x²) |₀¹
= -(1/2).e⁻¹ - (-1/2).1
= (1/2)(1 - (1/e))