# Math Help - Would anyone be able to explain this problem to me step by step?

2. ## Re: Would anyone be able to explain this problem to me step by step?

Both $\cos(\theta)$ and $\sec(\theta)$ are continuous functions on an open interval containing $0$; $\sin(u)$ is continuous over all real numbers; and $5\sec(0) \neq 0$, you simply plug in zero. That is the only step.