If y^2 (1-x^2) = x^2 +1, show that (1-x^...

If `y^2 (1-x^2) = x^2 +1`, show that `(1-x^4) (dy/dx)^2 = y^4 -1`.

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If y^2 (1-x^2) = x^2 +1, show that (1-x^4) (dy/dx)^2 = y^4 -1.
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