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