Evaluate the Integral Using the Given Substitution $$\int \csc ^ { 2 } 9 \theta \cot 9 \theta d \theta , \quad u = \cot 9 \theta$$

question 280

Multiple Choice

Evaluate the integral using the given substitution.
- $$\int \csc ^ { 2 } 9 \theta \cot 9 \theta d \theta , \quad u = \cot 9 \theta$$

• A) \(- \frac { 1 } { 18 } \tan ^ { 2 } 9 \theta + C\)
• B) \(- \frac { 1 } { 18 } \cot ^ { 2 } 9 \theta + C\)
• C) \(\frac { 1 } { 18 } \cot ^ { 2 } \theta + C\)
• D) \(\frac { 1 } { 6 } \csc ^ { 3 } 9 \theta \cot ^ { 2 } 9 \theta + C\)

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