Transforming a cosine graph.
I am supposed to write an equation for a graph that shows the starting point at (0,-2) max at (3,0) next min at (just over 6, -2)
and it continues.
So it says write a sine/cosine equation.
I wrote a sine, but the answer shows a cosine, I know it can be either but my question is
for my a value I get 1
my d value is -1
and my x = 3 because the first max is at 3.
it gives y=-cosx-1 ?
so how did they get that?
I have a =+ but If you have a -a does your max become a min?