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a cone with the line from the vertex to the centre of the base perpendicular to the base.
decimal numbers that do not recur in a pattern after the decimal point. Instead, these numbers...
a value towards which a sequence or series tends; or a position towards which a line moves.
trigonometric identities that contain a combination angle, e.g. sin (A + B).
two lines are parallel if their gradients are the same. This means that the two lines can never...