posted by Tom .
If (e^x)(sin3x)=Im ((e^x)(e^i3x))
I get the answer(e^x)(cos3x-3sin3x) +C
My book gets the answer
Can any explain which answer is right and why
Integral of e^(1+3i)x =
e^(1+3i)x /(1+3i) + c
Multiplying numerator and denominator by (1-3i) gives:
If you take the imaginary part you get the answer given in your book.
I am such an idiot for some reason I differentiated not integrated. Thanks so much