Find the Indefinite Integral $$\int \cos ^ { 3 } 3 x d x$$

question 7

Multiple Choice

Find the indefinite integral. $$\int \cos ^ { 3 } 3 x d x$$

• A) \(\frac { \sin 3 x \left( 3 - \sin ^ { 2 } 3 x \right) } { 9 } + C\)
• B) \(\frac { \sin 3 x \left( 3 - \sin ^ { 4 } 3 x \right) } { 9 } + C\)
• C) \(\frac { \sin 3 x \left( 3 + \sin ^ { 2 } 3 x \right) } { 3 } + C\)
• D) \(\frac { \sin 3 x \left( 3 + \sin ^ { 4 } 3 x \right) } { 9 } + C\)
• E) \(\frac { \sin 3 x \left( 3 + \sin ^ { 2 } 3 x \right) } { 9 } + C\)

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