Answer :

Let's start by examining the given trigonometric expression:

[tex]\[ \cos \left(x + \frac{\pi}{3}\right) + 2\sqrt{2} \sin \left(x + \frac{\pi}{3}\right) - 3 \][/tex]

### Step-by-Step Solution:

1. Given Trigonometric Expression:

[tex]\[ \cos \left(x + \frac{\pi}{3}\right) + 2\sqrt{2} \sin \left(x + \frac{\pi}{3}\right) - 3 \][/tex]

2. Simplification:

Consider the expression:

[tex]\[ \cos \left(x + \frac{\pi}{3}\right) + 2\sqrt{2} \sin \left(x + \frac{\pi}{3}\right) \][/tex]

To simplify this, we can assume that the general form of such a combination of trigonometric functions often simplifies to either another trigonometric function or a constant factor. Specifically, when you have expressions like [tex]\(A \cos \theta + B \sin \theta\)[/tex], they can sometimes be combined into a single trigonometric function, like:

[tex]\[ R \cos (\theta - \phi) \quad \text{or} \quad R \sin (\theta + \phi) \][/tex]

3. Rewrite the Expression:

However, in our case, such a transformation is not straightforward due to the coefficients involved. But upon deeper inspection of the provided numerical evidence:

[tex]\[ \cos \left(x + \frac{\pi}{3}\right) + 2\sqrt{2} \sin \left(x + \frac{\pi}{3}\right) - 3 \][/tex]

We revisit the simplified result which confirms:

[tex]\[ 2.82842712474619 \sin \left(x + \frac{\pi}{3}\right) + \cos \left(x + \frac{\pi}{3}\right) - 3 \][/tex]

This suggests that the combination does not further simplify drastically but rather maintains its combined form.

4. Final Simplified Expression:

Thus, after verifying, we observe that the original expression simplifies to itself with coefficients intact:

[tex]\[ 2.82842712474619 \sin \left(x + \frac{\pi}{3}\right) + \cos \left(x + \frac{\pi}{3}\right) - 3 \][/tex]

### Conclusion:

The simplified expression derived from the given trigonometric function:

[tex]\[ \cos \left(x + \frac{\pi}{3}\right) + 2\sqrt{2} \sin \left(x + \frac{\pi}{3}\right) - 3 \][/tex]

is:

[tex]\[ 2.82842712474619 \sin \left(x + \frac{\pi}{3}\right) + \cos \left(x + \frac{\pi}{3}\right) - 3 \][/tex]

This simplification process confirms that the given expression holds true and does not reduce further in form.