Question

find dy/dx if y =2 sin (x square/3)

Answer 1

$y = 2 \sin( {x}^{2} + 3) \\ \frac{dy}{dx} = 2 \cos( {x}^{2} + 3 ) (2x)$
hope it will help you.
here we applied chain rule.

Answer 2

dy/dx= 2×2x^3 sin(x^2/3) /3
= (4x^3)cos(x^2/3) /3