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The integral int-a^a (sin^2x)/(1-x^2)dx,...

The integral `int_-a^a (sin^2x)/(1-x^2)dx,0ltalt1`, is equal to (A) `int_-a^a (sin^2x)/(1+x^2)dx` (B) `2int_0^a (sin^2x)/(1-x^2)dx` (C) `int_a^0 (sin^2x)/(1+x^2)dx` (D) `0`

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