# Thread: Heavily confused by bracket use in trig ratios

1. ## Heavily confused by bracket use in trig ratios

It seems to me that brackets are randomly thrown around when talking Sin, Cos and Tan.

For example, now I have a problem in my book that states an equation: $0.7sin100\pi t$ how am I to understand this?

As $0.7sin(100\pi t)$ or $0.7sin(100)\pi t$ ??

2. ## Re: Heavily confused by bracket use in trig ratios

From experience, arguments of trigonometric functions often have the form $n\pi x$, so I would say it's $0.7\sin(100\pi t)$. However, omitting parentheses does not give credit to the authors of the book. See this thread by an engineer with a Ph.D. turned high school teacher.

3. ## Re: Heavily confused by bracket use in trig ratios

Thanks. I'll go with that then. I agree on his post, I always write parentheses myself to avoid confusion.