Which of the given statements is not correct?

Step 1: Solve Question 4.
The question asks which of the given statements is not correct.

• a) $\sin 0^\circ = 0$ and $\cos 0^\circ = 1$. Since $0 \neq 1$, the statement $\sin 0^\circ = \cos 0^\circ$ is incorrect.
• b) $\tan 30^\circ = \frac{1}{\sqrt{3}}$ and $\cot 60^\circ = \frac{1}{\tan 60^\circ} = \frac{1}{\sqrt{3}}$. So, $\tan 30^\circ = \cot 60^\circ$ is correct.
• c) $\sin 30^\