add mathyd and posts/2021-12-05-mathyd-easy-tex-to-svg

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diff --git a/static/files/posts/mathyd-easy-tex-to-svg/cubic.tex.txt b/static/files/posts/mathyd-easy-tex-to-svg/cubic.tex.txt
new file mode 100644
index 0000000..6ca948c
--- /dev/null
+++ b/static/files/posts/mathyd-easy-tex-to-svg/cubic.tex.txt
@@ -0,0 +1,38 @@
+% solution to ax^3 + bx^2 + cx + d = 0
+% https://math.vanderbilt.edu/schectex/courses/cubic/
+\begin{align*}
+% first term
+x &= \sqrt[3]{
+  % first term, first subterm
+  \left ( \frac{-b^3}{27a^3} + \frac{bc}{6a^2} - \frac{d}{2a} \right ) +
+
+  \sqrt{
+    % first term, second subterm
+    \left ( \frac{-b^3}{27a^3} + \frac{bc}{6a^2} - \frac{d}{2a} \right )^2 +
+
+    % first term, third subterm
+    \left ( \frac{c}{3a} - \frac{b^2}{9a^2} \right )^3
+  }
+} \\
+
+&+
+
+% second term
+\sqrt[3]{
+  % first term, second subterm
+  \left ( \frac{-b^3}{27a^3} + \frac{bc}{6a^2} - \frac{d}{2a} \right ) -
+
+  \sqrt{
+    % second term, second subterm
+    \left ( \frac{-b^3}{27a^3} + \frac{bc}{6a^2} - \frac{d}{2a} \right )^2 +
+
+    % second term, third subterm
+    \left ( \frac{c}{3a} - \frac{b^2}{9a^2} \right )^3
+  }
+} \\
+
+&-
+
+% third part
+\frac{b}{3a}
+\end{align*}
diff --git a/static/files/posts/mathyd-easy-tex-to-svg/logo.svg b/static/files/posts/mathyd-easy-tex-to-svg/logo.svg
new file mode 100644
index 0000000..0b570e7
--- /dev/null
+++ b/static/files/posts/mathyd-easy-tex-to-svg/logo.svg
@@ -0,0 +1,2 @@
+<?xml version="1.0"?>
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