Use the Substitution Formula to Evaluate the Integral $$\int _ { 7 \pi / 6 } ^ { 7 \pi / 3 } 6 \cot \frac { t } { 7 } d t$$

question 291

Multiple Choice

Use the substitution formula to evaluate the integral.
- $$\int _ { 7 \pi / 6 } ^ { 7 \pi / 3 } 6 \cot \frac { t } { 7 } d t$$

• A) 42 ln 3
• B) 21 ln 3
• C) -21 ln 3
• D) -42 ln 3