`y = 1/4tan^4x`

`(dy)/dx `

`= (d(1/4tan^4x))/dx`

`= 1/4(d(tan^4x))/dx`

`= 1/4xx4tan^3x(d(tanx))/dx`

`= 1/4xx4tan^3xsec^2x`

`= tan^3xsec^2x`

So the answer is `(dy)/dx = tan^3xsec^2x`

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