Evaluate the Integral $$\int \sec ^ { 3 } 9 x d x$$

question 16

Multiple Choice

Evaluate the integral.
- $$\int \sec ^ { 3 } 9 x d x$$

• A) \(\frac { 1 } { 2 } \sec 9 x \tan 9 x - \frac { 1 } { 2 } \ln | \sec 9 x + \tan 9 x | + C\)
• B) \(\frac { 1 } { 18 } \sec 9 x \tan 9 x + \frac { x } { 18 } + C\)
• C) \(\frac { 1 } { 18 } \sec ^ { 2 } 9 x \tan 9 x + \frac { 1 } { 18 } \ln | \sec 9 x + \tan 9 x | + C\)
• D) \(\frac { 1 } { 18 } \sec 9 x \tan 9 x + \frac { 1 } { 18 } \ln | \sec 9 x + \tan 9 x | + C\)

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