Math Is Fun Forum

Martin Dalskov

Guest

Double partial definite integration

Hi!

I've tried almost everything! I have the answer, but not the step by step calculations! Please help me!

integrate (integrate (x*e^x)*siny dy from y=0 to pi) dx from x=0 to 1)

Hope everybody understands that. It's written en Wolfram Alpha... The result is =2 but i don't know how to get there! HELP!!!

Bob

Administrator

Registered: 2010-06-20

Posts: 10,649

Re: Double partial definite integration

hi Martin Dalskov

so treat the 'x' components as constants and integrate sin y with respect to y

I'm going to use integration by parts

integral becomes

Hope that helps. 

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob