Question

Couple Questions...

Answer 1

Does the question mean what is the domain as taken from the chart OR what is the domain of the cosine function?

Answer 2

The domain of the cosine function. (:

Answer 3

The domain of a function is the set of acceptable values of x. Usually the domain for the trig functions is given in terms of radians which are Real numbers. Degrees are not real numbers.

Answer 4

Forget about the domain for a minute and look at your graph. The range is the set of possible values of y. How big did y get on the graph? How small did y dip on the graph?

Answer 5

-1 ?

Answer 6

and 1 ? I'm getting these answers by looking at where it dips the lowest and looking at where it starts 1.

Answer 7

That's right. The range is all real numbers between and including -1 and +1.

In interval notation, that is written as [-1, 1] which means -1 ≤ y ≤ 1.

Answer 8

There are no numbers excluded from the domain, the set of acceptable values of x.

So, the domain is, in interval notation, (-∞, +∞) which means all real numbers.
You can write it as -∞ < x < +∞

Answer 9

@dopegyal_ Where does the graph cut the y-axis? That will be the y-intercept.

Answer 10

@Directrix -90 , 90 ?

Answer 11

No.

Answer 12

Where is the Wolf's graph?

The y-intercept is where the graph cuts the y-axis. Look at the graph.
Hint: The x-coordinate of the y-intercept is 0.

Answer 13

lol ... 1 ?

Answer 14

Yes, some people would say 1 is the y-intercept. That is correct.
The coordinates of the y-intercept are (0,1).

Answer 15

The x-intercepts of y = cos(x) are many. Look how many times the graph cuts the x-axis.

Answer 16

Here is a chart you need to study.

Answer 17

And, this, too.

Answer 18

What am I supposed to put over the 2 ? ..

Answer 19

What 2?

Think of pi as 180 degrees.

Answer 20

The cosine graph has infinitely many x-intercepts.

Answer 21

Ohhh, okay I got you now. I definitely will study that.

Answer 22

Every 90 degrees, there is an x-intercept. Dreaming up a way to name them is baffling at first.