Editor
The value of $\int_{0}^{\frac{\pi}{4}} \theta \sec^{2}\theta d \theta$ is:
Difficulty: Easy
A: 
$1-\log\sqrt{2}$
B: 
$\frac{\pi}{4}-\log2$
C: 
$\frac{\pi}{4}-\frac{1}{2}ln2$
D: 
$\frac{\pi}{4}+\frac{1}{2}ln2$