Question

Can anyone help with this AP Calculus AB problem?
Here is the picture of the question.
Thanks in advanced
http://prntscr.com/7u6a4c

Answer 1

do you know the product rule?

Answer 2

yes u'v(uv')

Answer 3

you add them :)
\[\frac{ d(uv) }{ dx }=u'v+uv'\]

Answer 4

So you can let u = x and v = sin x

Answer 5

Ohh and if i get xsinx than its true

Answer 6

Looks like its asking you to take the 3rd derivative of x sin x and if that matches the stuff on the right it's true

Answer 7

oh okay ill try it

Answer 8

I got -3sinx+xcosx

Answer 9

so its false

Answer 10

I got -3 sin x - x cos x

Answer 11

Oh I must have missed the negative

Answer 12

So it would be true than

Answer 13

yes

Answer 14

Thank you so much!

Answer 15

yw