(i think i know it just checking) which function has a period equal to half the period of the function in y=5cos(3/5x-pi)+4.. the period is 10pi/3

i think its the first one.

1. y=5sin(6/5x-pi)-4
2. y=-5/2sin(6/10x-2pi)+1/2
3. y=-4cos(5/6x-2pi)+5
4. y=2cos(3/10x-pi)-5/2

Step-by-step explanation:

The given function is

Where

Notice half the period is

Now, in the first function

Notice that this function is in the form:

Where , which definition is

Replacing this value, we have

Which means the first function is has half the period of the given function.

hi,

3. 12.15, you are correct.

4.2.01, your first digit is correct,

hope this !

the answer is d. (1.2, -4.7) on edgn

hope this !