Which of the following is/are incorrect?
(A) $$\sin 0^\circ = 0$$
(B) $$ an 0^\circ = 0$$
(C) $$\csc 0^\circ = 0$$
(D) $$\sec 0^\circ = 0$$

Question

Which of the following is/are incorrect?  
(A) $$\sin 0^\circ = 0$$  
(B) $$	an 0^\circ = 0$$  
(C) $$\csc 0^\circ = 0$$  
(D) $$\sec 0^\circ = 0$$

Accepted Answer

1. **Evaluate each trigonometric function at $$0^\circ$$**:  
   - **(A):** $$\sin 0^\circ = 0$$. This is correct.  
   - **(B):** $$	an 0^\circ = 0$$. This is also correct.  
   - **(C):** $$\csc 0^\circ = \frac{1}{\sin 0^\circ}$$. Since $$\sin 0^\circ = 0$$, $$\csc 0^\circ$$ is undefined, not zero. This is incorrect.  
   - **(D):** $$\sec 0^\circ = \frac{1}{\cos 0^\circ}$$. Since $$\cos 0^\circ = 1$$, $$\sec 0^\circ = 1$$, not zero. This is incorrect.

2. **Identify the incorrect statements**:  
   Statements **(C)** and **(D)** are incorrect.

Thus, the correct answer is **(d)** (C), (D), and (E) only.

Answer

Answer

Answer