It's pretty close to being right! Your function is and, using the product rule and chain rule, you have
, which is correct.
But you appear to be canceling that "-1/3" with the "3" at the end of the formula. You cannot do that because they are not multiplied together. You can cancel the "1/3" with the "3" at the beginning of the fomula: . You can, in addition, factor out: .
You have a lot of algebraic mistakes.
In line 2, why did you cross out the 1/3 and 3 (on the right)? They do not cancel out because they are not being multiplied together, notice there is a plus in between them. The 1/3 and the 3 (on the left) can cancel out because they're being multiplied.
In the third line, why did you randomly cross out
In the forth line, you cannot bring the like that. Can you see your mistake?