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Evaluate the Integral sec39xdx\int \sec ^ { 3 } 9 x d x

Question 213

Multiple Choice

Evaluate the integral.
- sec39xdx\int \sec ^ { 3 } 9 x d x


A) 118sec29xtan9x+118lnsec9x+tan9x+C\frac { 1 } { 18 } \sec ^ { 2 } 9 x \tan 9 x + \frac { 1 } { 18 } \ln | \sec 9 x + \tan 9 x | + C
B) 12sec9xtan9x12lnsec9x+tan9x+C\frac { 1 } { 2 } \sec 9 x \tan 9 x - \frac { 1 } { 2 } \ln | \sec 9 x + \tan 9 x | + C
C) 118sec9xtan9x+x18+C\frac { 1 } { 18 } \sec 9 x \tan 9 x + \frac { x } { 18 } + C
D) 118sec9xtan9x+118lnsec9x+tan9x+C\frac { 1 } { 18 } \sec 9 x \tan 9 x + \frac { 1 } { 18 } \ln | \sec 9 x + \tan 9 x | + C

Correct Answer:

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