Question

[Y] Differentiate the Function:
http://i1084.photobucket.com/albums/j409/QRAWarrior/MATA30/MATA30-IMG-008.png

(Attempt shown, what have I done wrong?)
[Y] Differentiate the Function:
http://i1084.photobucket.com/albums/j409/QRAWarrior/MATA30/MATA30-IMG-008.png

(Attempt shown, what have I done wrong?)
@Mathematics

Answer 1

are you using the product rule? (And remember the chain rule when differentiating that radical.

Answer 2

OH actually you have everything right except the 5 at the end should be - because the derivative of arccos is negative