Find the distance between the points `( acostheta, asintheta) ` from the origin.

Explanation

To find the distance between the point \( (a \cos \theta, a \sin \theta) \) and the origin \( (0, 0) \), we can use the distance formula. Here’s a step-by-step solution:

### Step 1: Identify the points
We have two points:
- The origin \( O(0, 0) \)
- The point \( P(a \cos \theta, a \sin \theta) \)

### Step 2: Write the distance formula
...