To find the value of \(\cos\left(\frac{2x}{3}\right)\), you'll need a specific value for \(x\). Without a numeric input for \(x\), I can’t provide a specific numerical value for \(\cos\left(\frac{2x}{3}\right)\).
If you have a particular value for \(x\), you can plug that value into the expression to compute \(\cos\left(\frac{2x}{3}\right)\). Alternatively, if you're looking for a formula involving cosine or ways to calculate it in general, please let me know!