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If roots of 2(x-a)(x+b)+c=0 are alpha an...

If roots of `2(x-a)(x+b)+c=0` are `alpha` and `beta` roots of `(x-alpha)(x-beta)-c/2=0` are `lamda a` an `mu b`, then `1/(lamda +mu)` is (where a and b are non zero real numbers)

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