Question

f(x) = 2cos(x)

What is the domain and range?
Can you graph this function as well ?

Answer 1

I think cosine functions go forever, the domain is

(- infinity, infinity)

Answer 2

range is -2,2

Answer 3

and the domain?

Answer 4

domain [0,pie]
range[-1,1]

Answer 5

can you graph this for me?

Answer 6

http://www.wolframalpha.com/input/?i=f%28x%29%3D2cos%28x%29

Answer 7

hold the phone. you can take the cosine of any number. therefore, as meverett said, the domain is
\[(-\infty,\infty)\]

Answer 8

so the domain is all real numbers?

Answer 9

and the range?

Answer 10

yes, all real number
\[\mathbb R\]

Answer 11

and the range?

Answer 12

\[[-2,2]\]

Answer 13

what zbay said

Answer 14

can you graph this for me so i can get a better view?

Answer 15

range = [_2,2]

Answer 16

click the link i posted it's graphed

Answer 17

zbay graphed it using wolfram. link is above

Answer 18

which one is the correct one? the first or second graph?

Answer 19

they are both correct just looked at in different windows

Answer 20

i can save it..do you mind if you can draw it?

Answer 21

cant*

Answer 22

Right click the graph you want and you should be able to save it that way.