Question

how does the parameter 'A' alter the graph of y=sin(Ax), compared to y=sin(x)

Answer 1

you can start by trying with some numeric values:
for example, if a=2, you can see that the value that sin(x) used to take correspondos now to x/2 : sin(2*x/2)=sin(x)

Answer 2

thanks! I got it now. You rock.