Question

Please help Integral sin (ln x) dx

Answer 1

lnx=t
dx=(e^t)dt and then integration by parts.

Answer 2

thanks a lot :)

is the answer 1/2 e^x ( sin ln x - cos ln x ) ??

Answer 3

it's just (x/2) (sin lnx - cos lnx).
it's e^t not e^x
if e^t, then e^t=e^lnx=x

Answer 4

yeah, i see. e^t
but i don't know why you write (x/2) ?
i got (e^t)/2