Find the value of `(sec^(2)A-1)`.

Answer

To find the value of \( \sec^2 A - 1 \), we can follow these steps:

### Step-by-step Solution:

1. **Recall the Trigonometric Identity**:
We know from trigonometric identities that:
\[ \sec^2 A = 1 + \tan^2 A \]

2. **Substitute the Identity into the Expression**:
We can substitute \( \sec^2 A \) in the expression \( \sec^2 A - 1 \):
\[ \sec^2 A - 1 = (1 + \tan^2 A) - 1 \]

3. **Simplify the Expression**:
Now, simplify the expression:
\[ (1 + \tan^2 A) - 1 = \tan^2 A \]

4. **Final Result**:
Therefore, the value of \( \sec^2 A - 1 \) is:
\[ \tan^2 A \]

### Conclusion:
The final answer is:
\[ \sec^2 A - 1 = \tan^2 A \]