Integral calculus application of calculus | single variable calculus

∫ {(x² - 1)/(x⁴ + 1)}dx   OR ∫ {(x^2 - 1)/(x^4 + 1)}dx
Integral calculus ap calculus | single variable calculus technique of integration applied calculus example∫ {(x² - 1)/(x⁴ + 1)}dx OR ∫ {(x^2 - 1)/(x^4 + 1)}dx