Which one of the following is $TRUE$?
- A$x \cdot \int \frac{dx}{x} = x \ln |x| + C$
- B$x \cdot \int \frac{dx}{x} = x \ln |x| + Cx$
- C$\frac{1}{\cos x} \cdot \int \cos x \, dx = \tan x + C$
- D$\frac{1}{\cos x} \cdot \int \cos x \, dx = x + C$
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