Quiz 3:口訣快解或令 \(u = ax + b\)
求不定積分 \(\int {\frac{1}{{2x + 5}}\;dx} \)
\(\frac{1}{{2{{(2x + 5)}^2}}} + C\)
\({(2x + 5)^2} + C\)
\(\ln (2x + 5) + C\)
\(\frac{{\ln (2x + 5)}}{2} + C\)