# Conics in Polar Coordinates: Unified Theorem: Hyperbola Proof

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In this video I go over further into the Unified the Theorem for Conics and this time prove it is applicable for hyperbolas. Recall that the theorem states that a conic is formed when the ratio of the distance to the focus divided by the distance to the directrix is a constant e, called the eccentricity. In my earlier videos I proved the case for parabolas (e = 1) and ellipses (e is less than 1), and in this video I prove the case for when e is greater than 1, i.e. for hyperbolas. But to save time I carry off from the proof of ellipses in which I first derived a formula for the conic for the general case of e is not equal to 1. The resulting formula in Cartesian or Rectangular coordinates looks very much like that for ellipses and hyperbolas, but the different values of e decides which conic is described. For the case that e is greater than 1, I show that indeed the unified theorem describes a hyperbola, and in fact it is a shifted horizontally shifted horizontal hyperbola. And just like for the ellipses case, the focus defined by the unified theorem is the exact same as that defined by the conventional theorem, albeit having two foci.

This is a very important video to understand how different theorems can describe the same curve but for better or worse across different coordinate systems. I will be going over some examples in later videos to better illustrate this theorem and its very simple formulation in polar coordinates so stay tuned!

View video notes on the Hive blockchain: https://peakd.com/mathematics/@mes/conics-in-polar-coordinates-unified-theorem-hyperbola-proof

Related Videos:

Conics in Polar Coordinates Playlist: https://www.youtube.com/playlist?list=PLai3U8-WIK0H4OJpJ2gslXVLT8mP-SgJP
Conics in Polar Coordinates: Unified Theorem: Ellipse Proof:

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