# Calculator trouble

1. Feb 23, 2009

hello my calculator cant do Cos^4(10).
my lecturer i think said that Cos(10^4) would give the same answer but i cant remember what exactly he said. Please help me!

2. Feb 23, 2009

### lurflurf

Cos^4(10)=(Cos(10))^4~0.49567377320016326248312233272211
Cos(10^4)~-0.95215536825901485124038676066331

3. Feb 24, 2009

### HallsofIvy

Staff Emeritus
WHY can't your calculator do cos4(10)? It certainly looks straightforward. Do you get some kind of error message?

4. Feb 24, 2009

### uart

Well from your post it's pretty clear that you don't even understand what cos^4(10) means, so surely the underlying problem is here and not with the calculator.

$\cos^n(x)$ means $(\cos\,x)^n$, ok.

So now you know what it means I suppose that your calculator will now be able to do it.