Plug cos^2(30) into my scientific calculator

1. Dec 4, 2006

starfish794

How would I plug cos^2(30) into my scientific calculator to get the right answer? Thanks.

2. Dec 4, 2006

arildno

What does cos^2(30) mean?

3. Dec 4, 2006

starfish794

I don't remember, its been years since I've done that kind of math.

4. Dec 4, 2006

arildno

Well, then, look it up in a math book.

Hint: What does ^2 mean in the expression?

Last edited: Dec 4, 2006
5. Dec 4, 2006

kinthos

There is a distinct difference between cos T^2 and cos^2 T. (Pretend that T=the angle.) Your problem asks for cos^2 T, or (cos T)^2 (calculator form). This means (cos T)(cos T), rather than cos (T*T).