Maybe use the product rule from here?
Posted by pickslides from this thread:
http://www.mathhelpforum.com/math-he...on-153220.html
Interesting... Here is another instance of alexprem and ilovemymath posting the exact same question.Wow this is really similar to http://www.mathhelpforum.com/math-he...on-153221.html
Are you in the same class or the same person?
http://www.mathhelpforum.com/math-he...ve-153114.html
Coincidence?