Solve: `sec2theta=2/sqrt(3)`

Explanation

To solve the equation \( \sec(2\theta) = \frac{2}{\sqrt{3}} \), we will follow these steps:

### Step 1: Rewrite the equation in terms of cosine
The secant function is the reciprocal of the cosine function. Therefore, we can rewrite the equation as:
\[ \sec(2\theta) = \frac{1}{\cos(2\theta)} \]
This gives us:
...