Hi.... I'm learning how to graph sine and cosine functions, and I can't seem to figure out how to determine where the line intersects the x-axis? I think I understand how to shift up/down and to the right/left, as well as amplitude and period, but can't understand where to intersect. Can anyone help me? I did notice that the sine of pi= 0, and this is where a sine graph intersects, but what if the x-axis is not labeled in pi's but in integers instead? Thanks for any help!