Prove the following identity: `sec^4theta-sec^2theta=tan^4theta+tan^2theta`

Explanation

To prove the identity \( \sec^4 \theta - \sec^2 \theta = \tan^4 \theta + \tan^2 \theta \), we will start from the left-hand side (LHS) and manipulate it to show that it equals the right-hand side (RHS).

### Step-by-Step Solution:

1. **Start with the left-hand side (LHS):**
\[ \sec^4 \theta - \sec^2 \theta \]
...