If `veca=2veci+3vecj+4veck and vecb =4veci+3vecj+2veck`, find the angle between `veca and vecb`.

Explanation

To find the angle between the vectors \(\vec{a}\) and \(\vec{b}\), we can use the formula for the cosine of the angle between two vectors:

\[ \cos \theta = \frac{\vec{a} \cdot \vec{b}}{|\vec{a}| |\vec{b}|} \]

### Step 1: Identify the vectors
Given:
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