Evaluate the Integral $\int \operatorname { coth } ( 9 x ) d x$

question 24

Multiple Choice

Evaluate the integral.
- $\int \operatorname { coth } ( 9 x ) d x$

• A) \(\frac { 1 } { 9 } \ln | \sinh 9 x | + C\)
• B) \(\ln | \sinh 9 x | + C\)
• C) \(\frac { 1 } { 9 } \operatorname { csch } ^ { 2 } 9 x + C\)
• D) \(9 \ln \left( \sinh \frac { x } { 9 } \right) + C\)

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