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In trigonometry, is amplitude always absolute?

Thanks

Yes, for it is the measure of how far a curve rises above the center.

The negative part is the same and it is how far the curve falls below.

In an x-y plane, the amplitue is usually in the y direction.

This makes the frequency be in the x direction.

A good place to see them is http://www.jjgifford.com/expressions/geometry/frequency.html

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