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a graph or picture that looks identical on either side of a line, in particular, the y = x line.
a rule applied to variables to make an equation, so that there is only one answer (output value...
when working with a right-angled triangle and trigonometric ratios, the side next to the angle...
represents the rate of change or gradient of a function at any particular point.
a model generated using objects or diagrams to understand and solve problems.