∫(x²- 1)/(x⁴ - 1) dx. Solve an interesting integration problem.
[1] Is integral 1/(x^2 + 1) dx = tan-1(x) + C ?
• Why ∫1/(x² + 1) dx = tan⁻¹(x) + C ?
[2] Is integral 1/(x^2 + a^2) dx = (1/a)tan-1(x/a) + C ?
• Why integral 1/(x² + a² ) dx = (1/a)t...
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