Write the principal value of `cos^(-1)(cos(2pi)/3)+sin^(-1)(s in(2pi)/3)`

Explanation

To solve the problem, we need to find the principal value of the expression \( \cos^{-1}(\cos(2\pi/3)) + \sin^{-1}(\sin(2\pi/3)) \).

### Step-by-step Solution:

1. **Evaluate \( \cos(2\pi/3) \)**:
\[ \cos(2\pi/3) = -\frac{1}{2} \]
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