Alguien me ayudaría a derivar esta expresión?

El resultado de la derivada de la expresión es : <img src="https://tex.z-dn.net/?f=-%5Cfrac%7Ba%7D%7B%5Csqrt%7Ba-x%7D%28a%2Bx%29%5E%7B3%2F2%7D%20%7D" />Reescribimos y ; y = <img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Csqrt%7Ba-x%7D%20%7D%7B%5Csqrt%7Ba%2Bx%7D%20%7D" />y = <img src="https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7Bdy%7D%20%5Csqrt%7B%5Cfrac%7Ba-x%7D%7Ba%2Bx%7D%7D" />Derivamos ; <img src="https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7Bdy%7D%20%3D%20%5Cfrac%7Bd%7D%7Bdy%7D%20%5Csqrt%7B%5Cfrac%7Ba-x%7D%7Ba%2Bx%7D%7D" />Aplicamos un cambio de variable ; f = √u ⇒ u = <img src="https://tex.z-dn.net/?f=%5Cfrac%7Ba-x%7D%7Ba%2Bx%7D" />sustituyo ; <img src="https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7Bdy%7D%20%3D%20%5Cfrac%7Bd%7D%7Bdu%7D%28%20%5Csqrt%7Bu%7D%29" /><img src="https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7Bdy%7D%28%20%5Cfrac%7Ba-x%7D%7Ba%2Bx%7D%29" />Aplicamos regla de la cadena, df(u) / dx = df / u .

Du / dx<img src="https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7Bdu%7D%28%20%5Csqrt%7Bu%7D%29" /> = <img src="https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%5Csqrt%7Bu%7D%20%7D" /> <img src="https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7Bdx%7D%28%20%5Cfrac%7Ba-x%7D%7Ba%2Bx%7D%29" /> Aplicamos la regla del cociente, (f / g)' = (f'.

G - f.

G') / g² = [img = 10] = [img = 11] = - 1 = [img = 12] = 1 = [img = 13]simplificar ; = [img = 14] = [img = 15] = [img = 16]Devuelvo el cambio de variable : = [img = 17]Simplificar ; = [img = 18] = [img = 19]Multiplicar : [img = 20][img = 21] = [img = 22].