For the curve $4x^5 = 5y^4$, the ratio of the cube of the subtangent at a point on the curve to the square of the subnormal at the same point is...

Question

$\left(\frac{4}{5}\right)^4$

$\left(\frac{5}{4}\right)^4$

$x\left(\frac{4}{5}\right)^4$

$y\left(\frac{5}{4}\right)^4$

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