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It's the equation of a wavy wiggly line graph that looks like a rope being waved

up and down.

The maximum value of the wavy graph is y=7, the minimum value is y=-7, and the

average is zero ... the x-axis cuts straight through the middle of all The Wiggles.

If 'x' is in degrees, then the graph crosses the x-axis at 22.5 and then again at

every 45 after that.

If 'x' is in radians, then the graph crosses the x-axis at (pi)/8 and then again at

every (pi)/4 after that.

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Q: What is y equals 7 cos 4x?
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