`y= 1/(x^4+3)^3 `

`==gt y= (x^4 + 3)^-3 `

`==gt y'= -3(x^3+3)' (x^4 +3)^-4 `

`==gt y'= -3(3x^2)(x^4+3)^-4 `

`==gt y'= (-9x^2)/(x^4+3)^4`

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