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when working with a right-angled triangle and trigonometric ratios, the side next to the angle in question, but not the hypotenuse.
a set that contains elements that are all part of a larger set (which contains other elements...
represents the rate of change or gradient of a function at any particular point.
in set theory, a union between two or more data sets refers to all the elements in the data sets...
a line drawn from the vertex of a triangle perpendicular to the side opposite the vertex.