Find the direction cosines of x, y and z-axis.

Explanation

To find the direction cosines of the x, y, and z axes, we will follow these steps:

### Step 1: Understand Direction Cosines
Direction cosines are the cosines of the angles that a line makes with the coordinate axes. For the x, y, and z axes, we need to determine the angles they make with themselves and with each other.

### Step 2: Identify Angles for Each Axis
- The angle between the x-axis and itself is 0°.
- The angle between the x-axis and the y-axis is 90°.
...