Which of the following has value zero:

Options

A. `sin0^circ`
B. `tan0^circ`
C. `cos0^circ`
D. `cot0^circ`

Explanation

To solve the question "Which of the following has value zero?", we will evaluate the trigonometric functions at the angle of 0 degrees (or 0 radians).

### Step-by-Step Solution:

1. **Evaluate sin(0)**:
- The sine function at 0 degrees is defined as:
\[ \sin(0) = 0 \]

2. **Evaluate cos(0)**:
- The cosine function at 0 degrees is defined as:
\[ \cos(0) = 1 \]

3. **Evaluate tan(0)**:
- The tangent function is defined as the ratio of sine to cosine:
\[ \tan(0) = \frac{\sin(0)}{\cos(0)} = \frac{0}{1} = 0 \]

4. **Evaluate cot(0)**:
- The cotangent function is defined as the ratio of cosine to sine:
\[ \cot(0) = \frac{\cos(0)}{\sin(0)} = \frac{1}{0} \]
- Since division by zero is undefined, cot(0) does not have a value.

5. **Conclusion**:
- From the evaluations, we find that:
- \(\sin(0) = 0\)
- \(\tan(0) = 0\)
- \(\cot(0)\) is undefined
- \(\cos(0) = 1\)
- Therefore, the functions that have a value of zero are \(\sin(0)\) and \(\tan(0)\).

### Final Answer:
The functions that have a value of zero are **sin(0)** and **tan(0)**.