Plug cos^2(30) into my scientific calculator

[starfish794]

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

 

[arildno]

What does cos^2(30) mean?

 

[starfish794]

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

 

[arildno]

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

Hint: What does ^2 mean in the expression?

 

[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).