A function must have a value for any given domain. For each edge (or interval), the sign graph has a sign (+ or -) . So, it is a function.
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No, a circle graph is never a function.
sine graph will be formed at origine of graph and cosine graph is find on y-axise
A line. The derivative of a function is its slope. If the slope is a constant then the graph is a line.
A derivative graph tracks the slope of a function.
If the graph is a function, no line perpendicular to the X-axis can intersect the graph at more than one point.