2. ∫3x^2/(x^3+5)dx
3. ∫cosx/(1+sinx)dx
更新1:
In(Ln(3+4x))dx In(3x^2/(x^3+5))dx In(cosx/(1+sinx))dx
更新2:
why in(d(x^3+5)/(x^3+5)) will be ln(x^3+5)+c?