Hey, this is my first time posting here so I will try to keep this brief!

So I am redoing pre-calculus to upgrade my math for post-secondary, and it's been a year since I did this in grade 12 so I'm pretty rusty. =(

I am going through limits at the moment and I came across the equation,

lim

__sinAx__ = A/B

x→0 Bx

Or otherwise

lim

__sinx__ = 1

x→0 x

Now this has helped me greatly in evaluating limits, but I remember there being a cosine limit something like this that also equals 1 which I could use to isolate and simplify the problem, but I just can't remember and I can't seem to find it in my textbooks, does anyone know of anything like this?

Thanks you very much for the help!

Kasper