differentiation

Question: If $y = \frac{1}{4}{u^4},u = \frac{2}{3}{x^3} + 5$, then $\frac{{dy}}{{dx}} = $



1) $\frac{1}{{27}}{x^2}{(2{x^3} + 15)^3}$
2) $\frac{2}{{27}}x{(2{x^3} + 5)^3}$
3) $\frac{2}{{27}}{x^2}{(2{x^3} + 15)^3}$
4) None of these
Solution: Explanation: Explanation
Implicit-function

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