If y=a[x+(x^2-1)^(1/2)]^n+b[x-(x^2-1)^(...

If `y=a[x+(x^2-1)^(1/2)]^n+b[x-(x^2-1)^(1/2)]^n` the value of the expression `(x^2-1)(d^2y) / dx^2+x dy / dx-n^2y` is __________.

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