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## Homework Statement

in the proof of triangle altitudes concurrency , i have found the equation of the Altitude AD,

x(x

_{2}-x

_{3})+y(y

_{2}-y

_{3})-x

_{1}(x

_{2}-x

_{3)-}y

_{1}(y

_{2}-y

_{3})

## Homework Equations

## The Attempt at a Solution

In the book other altitude equations are written by symmetry,

how is the idea of symmetry is used here ? , .

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