MCQ
$\int \frac{1+\tan x}{1-\tan x} d x$ is equal to:
- A$\sec ^2\left(\frac{\pi}{4}-x\right)+C$
- B$\sec ^2\left(\frac{\pi}{4}+x\right)+C$
- C$\log \left|\sec \left(\frac{\pi}{4}-x\right)\right|+C$
- ✓$\log \left|\sec \left(\frac{\pi}{4}+x\right)\right|+C$