$\int _ { 0 } ^ { \pi / 2 } \sec ^ { 2 } \left( x + \frac { \pi } { 4 } \right)$

question 51

Short Answer

$\int _ { 0 } ^ { \pi / 2 } \sec ^ { 2 } \left( x + \frac { \pi } { 4 } \right)$ dx
Enter just an integer.