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a line drawn from the vertex of a triangle perpendicular to the side opposite the vertex.
the point of intersection between the x-axis and the y-axis that is denoted by...
trigonometric identities that contain a combination angle, e.g. sin (A + B).
the point at which a graph cuts or intersects the y-axis.
data that is arranged in groups or intervals.
a sequence in which each term is the sum of the previous two terms. The sequence starts 1; 1; 2...