Differentiate `(tan x-(1)/(3secx))` with respect to 'x'.

Explanation

To differentiate the function \( y = \tan x - \frac{1}{3} \sec x \) with respect to \( x \), we will follow these steps:

### Step 1: Write the function
Let
\[ y = \tan x - \frac{1}{3} \sec x \]

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