From cdb6478d0b630163bae9ac668111ecc0ed480142 Mon Sep 17 00:00:00 2001
From: ulaulaman <gianluigi.ulaula@gmail.com>
Date: Mon, 3 Aug 2020 23:04:10 +0200
Subject: [PATCH] Update math tiddler

---
 index.html | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/index.html b/index.html
index 2fbd37e..e0e6ffa 100644
--- a/index.html
+++ b/index.html
@@ -11284,7 +11284,7 @@ See the [[control panel|$:/ControlPanel]] for more options.
 | *Masse* | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/sistema_solare/sistema_solare_masse.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/sistema_solare/pdf/sistema_solare_masse.pdf) |
 | *Densità* | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/sistema_solare/sistema_solare_densita.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/infographics/sistema_solare/pdf/sistema_solare_densita.pdf) |</pre>
 </div>
-<div created="20200803172912753" creator="ulaulaman" modified="20200803201324992" modifier="ulaulaman" title="Matematica" type="text/x-markdown">
+<div created="20200803172912753" creator="ulaulaman" modified="20200803210138732" modifier="ulaulaman" title="Matematica" type="text/x-markdown">
 <pre>## Mathematics
 
 | Title       | Source          | Pdf |
@@ -11303,6 +11303,7 @@ See the [[control panel|$:/ControlPanel]] for more options.
 | Trisecare un foglio di carta | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/trisecare_pagina.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/trisecare_pagina.pdf) |
 | Difference of two squares | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/differenze_quadrati.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/differenze_quadrati.pdf) |
 | Arctan 1/2 + Arctan 1/3 = pi/4 | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/arctan-pi4.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/arctan-pi4.pdf) |
+| Arctan 1/8 + pi/4 + Arctan 1/7 + Arctan 4/7 = pi/2 | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/arctan-pi2.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/arctan-pi2.pdf) |
 </pre>
 </div>
 <div caption="Menu" created="20200731231208687" creator="ulaulaman" list-before="$:/core/ui/SideBar/Open" modified="20200803173817167" modifier="ulaulaman" tags="$:/tags/SideBar" title="Menu" type="text/vnd.tiddlywiki">