Evaluate the Integral $$\int - 6 x \cos 9 x d x$$

question 154

Multiple Choice

Evaluate the integral.
- $$\int - 6 x \cos 9 x d x$$

• A) \(- \frac { 2 } { 3 } \cos 9 x - 6 x \sin 9 x + C\)
• B) \(- \frac { 2 } { 27 } \cos 9 x - \frac { 2 } { 3 } x \sin 9 x + C\)
• C) \(- \frac { 2 } { 27 } \cos 9 x - \frac { 2 } { 3 } x \sin 6 x + C\)
• D) \(- \frac { 2 } { 27 } \cos 9 x - \frac { 2 } { 3 } \sin 9 x + C\)

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