If three unit vectors `veca, vecb and vecc " satisfy" veca+vecb+vecc= vec0`. Then find the angle between `veca and vecb`.

Explanation

To find the angle between the unit vectors \(\vec{a}\) and \(\vec{b}\) given that \(\vec{a} + \vec{b} + \vec{c} = \vec{0}\), we can follow these steps:

### Step 1: Rearranging the Equation
From the equation \(\vec{a} + \vec{b} + \vec{c} = \vec{0}\), we can rearrange it to express \(\vec{c}\):
\[ \vec{c} = -(\vec{a} + \vec{b}) \]

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