If the momenta of two particles of a system are given by `vecp_(1)=2hati-hatj+3hatk` and `vecp_(2)=-hati+2hatj-2hatk` then calculate the angle made by the direction of motion of the system with positive x-axis.

Explanation

To solve the problem, we need to find the angle made by the direction of motion of the system with the positive x-axis using the momenta of the two particles.

### Step-by-Step Solution:

1. **Identify the momenta of the particles**:
We have two momentum vectors:
\[
\vec{p_1} = 2\hat{i} - \hat{j} + 3\hat{k}
...