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If the integrating factor of x(1-x^(2)) ...

If the integrating factor of `x(1-x^(2)) dy + 2(x^(2)y-y-ax^(3)) dx =0 `is `e^(int p dx)` where P is equal to`(kx^(2)-1)/(x(1-x^(2))` then what will be the value of k ?

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