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CH3 - fix P2 point and slope equation
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@icostan
icostan committed Apr 10, 2019
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6 changes: 3 additions & 3 deletions ch03.asciidoc
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Expand Up @@ -136,10 +136,10 @@ Specifically, when __x__~1~ ≠ __x__~2~:
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<ul class="simplelist">
<li><em>P</em><sub>1</sub> = (<em>x</em><sub>1</sub>,<em>y</em><sub>1</sub>), <em>P</em><sub>2</sub> = (<em>x</em><sub>3</sub>,<em>y</em><sub>3</sub>), <em>P</em><sub>3</sub> = (<em>x</em><sub>3</sub>,<em>y</em><sub>3</sub>)</li>
<li><em>P</em><sub>1</sub> = (<em>x</em><sub>1</sub>,<em>y</em><sub>1</sub>), <em>P</em><sub>2</sub> = (<em>x</em><sub>2</sub>,<em>y</em><sub>2</sub>), <em>P</em><sub>3</sub> = (<em>x</em><sub>3</sub>,<em>y</em><sub>3</sub>)</li>
<li><em>P</em><sub>1</sub> + <em>P</em><sub>2</sub> = <em>P</em><sub>3</sub></li>
<li><em>s</em> = (<em>y</em><sub>3</sub> – <em>y</em><sub>1</sub>)/(<em>x</em><sub>3</sub> – <em>x</em><sub>1</sub>)</li>
<li><em>x</em><sub>3</sub> = <em>s</em><sup>2</sup> – <em>x</em><sub>1</sub> – <em>x</em><sub>3</sub></li>
<li><em>s</em> = (<em>y</em><sub>2</sub> – <em>y</em><sub>1</sub>)/(<em>x</em><sub>2</sub> – <em>x</em><sub>1</sub>)</li>
<li><em>x</em><sub>3</sub> = <em>s</em><sup>2</sup> – <em>x</em><sub>1</sub> – <em>x</em><sub>2</sub></li>
<li><em>y</em><sub>3</sub> = <em>s</em>(<em>x</em><sub>1</sub> – <em>x</em><sub>3</sub>) – <em>y</em><sub>1</sub></li>
</ul>
++++
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