Answer to Question #84251 in Calculus for Sayem

Question #84251

Intregation of (x^2/(x^4-1))dx
So in solution
2nd line (x^2/((x^2-1) (x^2+1)))dx
3rd line ((1/2)÷(x^2-1)+(1/2)÷(x^2+1))dx
I didnot understand The 3rd line please explain and what is the formula?

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