最佳方法:
原式等于1/2∫[d(x∧2-2x-3)-2dx]/(x∧2-2x-3)
=1/2∫[d(x∧2-2x-3)]/(x∧2-2x-3)-∫2/(x∧2-2x-3)dx
=1/2ln(x∧2-2x-3)-∫2/(x+1)(x-3)dx
=1/2ln(x∧2-2x-3)-1/2∫[1/(x-3)]-[1/(x+1)]dx
=1/2ln(x∧2-2x-3)-1/2∫1/(x-3)dx
最佳方法:
原式等于1/2∫[d(x∧2-2x-3)-2dx]/(x∧2-2x-3)
=1/2∫[d(x∧2-2x-3)]/(x∧2-2x-3)-∫2/(x∧2-2x-3)dx
=1/2ln(x∧2-2x-3)-∫2/(x+1)(x-3)dx
=1/2ln(x∧2-2x-3)-1/2∫[1/(x-3)]-[1/(x+1)]dx
=1/2ln(x∧2-2x-3)-1/2∫1/(x-3)dx