Editor
$\int \sec^{2}(ax+b)dx$ is equal to:
Difficulty: Easy
A: 
$\tan^{2}(ax+b)$
B: 
$\frac{1}{2}\tan^{2}(ax+b)$
C: 
$\frac{1}{a}\tan^{2}(ax+b)$
D: 
$\tan(ax+b)$
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