∫e^(3x)f(e^(3x))dx
=1/3∫e^(3x)f(e^(3x))d(3x)
= 1/3∫f(e^(3x))d(e^(3x)) (令e^(3x) = t,代换)
= 1/3∫f(t)d(t)
= 1/3F(x) + C
PS:考研的同学吧,加油哦!
∫e^(3x)f(e^(3x))dx
=1/3∫e^(3x)f(e^(3x))d(3x)
= 1/3∫f(e^(3x))d(e^(3x)) (令e^(3x) = t,代换)
= 1/3∫f(t)d(t)
= 1/3F(x) + C
PS:考研的同学吧,加油哦!