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If a , b >0 , then minimum value of y=(b...

If `a , b >0` , then minimum value of `y=(b^2)/(a-x)+(a^2)/x` in `(0,a)` is `(a+b)/a` (b) `(a b)/(a+b)` `1/a+1/b` (d) `((a+b)^2)/a`

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