Question:

**Paragraph (continued):** Number of solutions of the same equation in $(0, 40\pi)$ is:

Step-by-Step Solution

Key Concept: The equation has period $2\pi$, with 2 solutions per period. In $(0,40\pi)$: 20 periods × 2 solutions = 40.

$\mathbf{40}$ solutions.

Correct Answer: 40