Cho a , b ∈ R , a ≠ 0. Phát biểu nào sau đây là đúng? A. ∫ e ^ (a x + b) d x = e b ∫ ( e ^ a ) ^ x d x = e b ⋅ ( e ^ a ) ^ x ln e a + C = e ^ a x + b a + C .

\(\int {{e^{ax + b}}} dx = {e^b}\int {{{\left( {{e^a}} \right)}^x}} dx = {e^b} \cdot \frac{{{{\left( {{e^a}} \right)}^x}}}{{\ln {e^a}}} + C = \frac{{{e^{ax + b}}}}{a} + C.\)

\(\int {{e^{ax + b}}} dx = {e^b}\int {{{\left( {{e^a}} \right)}^x}} dx = {e^b} \cdot {\left( {{e^a}} \right)^x} + C = {e^{ax + b}} + C.\)

\(\int {{e^{ax + b}}} dx = {e^b}\int {{{\left( {{e^a}} \right)}^x}} dx = {e^b} \cdot \frac{{{{\left( {{e^a}} \right)}^x}}}{{\ln {e^a}}} + C = \frac{{{e^{bx + a}}}}{a} + C.\)

\(\int {{e^{ax + b}}} dx = {e^b}\int {{{\left( {{e^a}} \right)}^x}} dx = {e^b} \cdot \frac{{{{\left( {{e^a}} \right)}^x}}}{{\ln {{\rm{e}}^a}}} + C = \frac{{{e^{ax + b}}}}{b} + C.\)