By parts: ∫ ln(x) dx = x ln(x) - ∫ x * (1/x) dx = x ln(x) - x + C.
By parts: Let u = x, dv = e^x dx. Then du = dx, v = e^x. So ∫ x e^x dx = x e^x - ∫ e^x dx = (x - 1)e^x + C.
By parts: Let u = x, dv = cos(x) dx → du = dx, v = sin(x). So ∫ x cos(x) dx = x sin(x) - ∫ sin(x) dx = x sin(x) + cos(x) + C.
Repeated parts: ∫ x^2 e^x dx = (x^2 - 2x + 2)e^x + C.
By parts: u = x, dv = sin(x) dx → du = dx, v = -cos(x). So ∫ x sin(x) dx = -x cos(x) + ∫ cos(x) dx = -x cos(x) + sin(x) + C.
Let u = ln(x), dv = dx/x. Then du = dx/x, v = ln(x). So ∫ (ln(x))/x dx = (ln(x))^2/2 + C.
By parts: u = tan⁻¹(x), dv = x dx. Then du = dx/(1+x^2), v = x^2/2. Result: (x^2/2) tan⁻¹(x) - (1/2) ln(1+x^2) + C.
By parts (or standard result): ∫ e^x cos(x) dx = (e^x/2)(sin(x) + cos(x)) + C.
By parts (or standard result): ∫ e^x sin(x) dx = (e^x/2)(sin(x) - cos(x)) + C.
By parts: u = ln(x), dv = x^2 dx. Then du = dx/x, v = x^3/3. Result: (x^3/3) ln(x) - x^3/9 + C.