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(1/2)* Integral (2x + 2) dx / raiz de ( x^2+2x-4)
u = x^2 + 2x - 4
du = 2x + 2 dx
1/2 * integral ( du / u)
= 1/2 Ln |u|
= 0.5 Ln | x^2 + 2x - 4 |