Evaluate the Integral $$\int 3 \cos ^ { 4 } 3 x d x$$

question 72

Multiple Choice

Evaluate the integral.
- $$\int 3 \cos ^ { 4 } 3 x d x$$

• A) \(\frac { 9 } { 4 } x + \frac { 1 } { 4 } \sin 3 x + \frac { 1 } { 32 } \sin 6 x + C\)
• B) \(\frac { 9 } { 4 } x + \frac { 1 } { 4 } \sin 3 x + \frac { 1 } { 8 } \sin 12 x + C\)
• C) \(\frac { 9 } { 8 } x + \frac { 1 } { 2 } \sin 6 x + \frac { 3 } { 32 } \sin 12 x + C\)
• D) \(\frac { 9 } { 8 } x + \frac { 1 } { 4 } \sin 6 x + \frac { 1 } { 32 } \sin 12 x + C\)

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