(d) Let $I = \int_{}^{}{e^{x\log a}.e^{x}}\ dx = \int_{}^{}a^{x}.e^{x}\ dx$ $= \int_{}^{}(ae)^{x}dx = \frac{(ae)^{x}}{\log_{e}{ae}} + c$
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Ph.D. in Physics with 19+ years of teaching experience.