Find the length of the curve.
-The line segment $r = 9 \sec \theta , 0 \leq \theta \leq \frac { \pi } { 4 }$
A) 9
B) $9 \ln \left( \tan \left( \frac { 3 \pi } { 8 } \right) \right)$
C) $\frac { \pi } { 4 }$
D) $\frac { 9 } { 2 } ( \sqrt { 2 } + \ln ( \sqrt { 2 } + 1 ) )$

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The Answer of Find the length of the curve.
-The line segment $r = 9 \sec \theta , 0 \leq \theta \leq \frac { \pi } { 4 }$
A) 9
B) $9 \ln \left( \tan \left( \frac { 3 \pi } { 8 } \right) \right)$
C) $\frac { \pi } { 4 }$
D) $\frac { 9 } { 2 } ( \sqrt { 2 } + \ln ( \sqrt { 2 } + 1 ) )$

Find the Length of the Curve r=9sec⁡θ,0≤θ≤π4r = 9 \sec \theta , 0 \leq \theta \leq \frac { \pi } { 4 }r=9secθ,0≤θ≤4π​

Find the Length of the Curve $r = 9 \sec \theta , 0 \leq \theta \leq \frac { \pi } { 4 }$