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biologystu

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**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!