Question

in the graph y=cos x what are the values of x in the interval (0, 4pi)

Answer 1

I do not understand what is being asked.

Answer 2

Refer to the graph of
y = sin x or y = cos x
to find the exact values of x in the interval [0, 4π] that satisfy the equation.

Answer 3

What is the equation you want to solve?

Answer 4

I'm trying to figure out what the values of x are. x=?

Answer 5

I'm trying to figure out what equation you are trying to solve for x.

I just do not see an equation.

Answer 6

I think you are leaving out some info from the question.

Answer 7

There is no equation. The entire problem is... Refer to the graph of y = sin x or y = cos x to find the exact values of x in the interval [0, 4π] that satisfy the equation. x=?

Answer 8

cos x =1

Answer 9

OK. Look at the graph of cos x.

Answer 10

You can clearly see that from 0 to 4pi, there are 3 values of x when cos x = 1, and that will occur when x = 0, 2pi, and 4pi.

So if you want when cos x = 1 in the OPEN interval (0, 4 pi), then only x = 2 pi satisfies that equation.

Does that make sense?

Answer 11

The open interval (0, 4 pi) means that 0 and 4 pi are not to be included in the solution.

Answer 12

@alicia14

?