Evaluate the equation ;-
cos `90^(@) sin 0^(@) - sin 0^(@) cos 90^(@)`.

Answer

To evaluate the expression \( \cos 90^\circ \sin 0^\circ - \sin 0^\circ \cos 90^\circ \), we will follow these steps:

### Step 1: Identify the values of trigonometric functions
We need to know the values of \( \sin 0^\circ \) and \( \cos 90^\circ \).

- \( \sin 0^\circ = 0 \)
- \( \cos 90^\circ = 0 \)

### Step 2: Substitute the values into the expression
Now we can substitute these values into the expression:

\[ \cos 90^\circ \sin 0^\circ - \sin 0^\circ \cos 90^\circ = 0 \cdot 0 - 0 \cdot 0 \]

### Step 3: Simplify the expression
Now we simplify the expression:

\[ 0 \cdot 0 - 0 \cdot 0 = 0 - 0 = 0 \]

### Step 4: Write the final answer
Thus, the value of the expression \( \cos 90^\circ \sin 0^\circ - \sin 0^\circ \cos 90^\circ \) is:

\[ \boxed{0} \]