Two equal vector have a resultant equal to either of them, then the angle between them will be:

Explanation

To solve the problem, we need to find the angle between two equal vectors when their resultant is equal to either of them. Let's denote the equal vectors as \( \vec{F} \).

### Step-by-Step Solution:

1. **Define the Vectors**:
Let the two equal vectors be \( \vec{F} \) and \( \vec{F} \). Since they are equal, we can denote their magnitude as \( F \).

2. **Use the Resultant Formula**:
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