Prove that : Suppose that x and y are po...

Prove that : Suppose that x and y are positive and x is very small when compared to y. Then find an approximate value of
`((y)/(y+x))^(3//4)-((y)/(y+x))^(4//5)`

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The correct Answer is:

`(1)/(20) ((x)/(y)) -(11)/(800) ((x)/(y))^(2)`

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