New definition of a parabola with focus and directrix

The video tutorial introduces the concept of a parabola, focusing on its vertex and axis of symmetry. It further explains the focus and directrix, emphasizing their equal distances from any point on the parabola. The tutorial also introduces the lattice rectum, a line perpendicular to the axis of symmetry that aids in graphing. These elements form the new definition of a parabola, enhancing understanding of its geometric properties.

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