From 814e716cf003500ada840fcf7cc2c6cada41e1cb Mon Sep 17 00:00:00 2001
From: Paul Duncan <pabs@pablotron.org>
Date: Tue, 7 Nov 2017 23:45:13 -0500
Subject: remove old help

---
 htdocs/index.html | 277 ------------------------------------------------------
 1 file changed, 277 deletions(-)

diff --git a/htdocs/index.html b/htdocs/index.html
index f1327fc..d8119ec 100644
--- a/htdocs/index.html
+++ b/htdocs/index.html
@@ -58,283 +58,6 @@
         </a><!-- btn -->
 
         <ul id='help' class='dropdown-menu'>
-          <li class='dropdown-header'>
-            Examples
-          </li>
-
-          <li>
-            <a
-              href='#'
-              class='example'
-              data-text='
-                \lim_{x \to \infty}{\frac{1}{x^2}}
-              '
-            >1. Some Limit</a>
-          </li>
-
-          <!-- li>
-            <a
-              href='#'
-              class='example'
-              data-text='
-                \begin{align*}
-                  &= \int_0^2{x^2 + 5x + 2}\,\text{d}x \\
-                  &= \int{x^2 + 5x + 2}\,\text{d}x \\
-                  &= \frac{1}{3}x^3 + \frac{5}{2}x^2 + 2x + c \\
-                  &= \frac{1}{3}2^3 + \frac{5}{2}2^2 + 2\times2 -
-                     (\frac{1}{3}0^3 + \frac{5}{2}0^2 + 2\times0) \\
-                  &= \frac{8}{3} + \frac{20}{2} + 4 \\
-                  &= 14 + \frac{8}{3} \\
-                  &= \frac{50}{3}
-                \end{align*}
-              '
-            >Test 2</a>
-          </li -->
-
-          <li>
-            <a
-              href='#'
-              class='example'
-              data-text='
-\text{Quadratic Formula} \\
-x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
-              '
-            >2. Quadratic Formula</a>
-          </li>
-
-          <li>
-            <a
-              href='#'
-              class='example'
-              data-text='
-\text{Cross Product via Matrix Determinant} \\
-
-\begin{align*}
-    \vec{a} \times \vec{b} & = \begin{vmatrix}
-        \hat{i} & \hat{j} & \hat{k} \\
-        \vec{a}_x & \vec{a}_y & \vec{a}_z \\
-        \vec{b}_x & \vec{b}_y & \vec{b}_z
-    \end{vmatrix} \\
-
-    & =
-    \begin{vmatrix}
-        \vec{a}_y & \vec{a}_z \\
-        \vec{b}_y & \vec{b}_z
-    \end{vmatrix} \hat{i} -
-
-    \begin{vmatrix}
-        \vec{a}_x & \vec{a}_z \\
-        \vec{b}_x & \vec{b}_z
-    \end{vmatrix} \hat{j} +
-
-    \begin{vmatrix}
-        \vec{a}_x & \vec{a}_y \\
-        \vec{b}_x & \vec{b}_y
-    \end{vmatrix} \hat{k} \\
-
-    & =
-    (\vec{a}_y\vec{b}_z - \vec{a}_z\vec{b}_y)\hat{i} -
-    (\vec{a}_x\vec{b}_z - \vec{a}_z\vec{b}_x)\hat{j} +
-    (\vec{a}_x\vec{b}_y - \vec{a}_x\vec{b}_y)\hat{k} \\
-
-    & =
-    \langle
-        \vec{a}_y\vec{b}_z - \vec{a}_z\vec{b}_y\text{, }
-        \vec{a}_x\vec{b}_z - \vec{a}_z\vec{b}_x\text{, }
-        \vec{a}_x\vec{b}_y - \vec{a}_y\vec{b}_z
-    \rangle \\
-
-    \vec{a} & = \langle2, 1, -1\rangle \\
-    \vec{b} & = \langle-3, 4, 1\rangle \\
-    \vec{a} \times \vec{b} & = \langle
-        (1)(1) - (-1)(4),
-        (2)(1) - (-1)(-3),
-        (2)(4) - (1)(-3)
-    \rangle \\
-
-    & = \langle
-        5, 5, 11
-    \rangle \\
-    \vec{b} \times \vec{a} & = \langle
-        (4)(-1) - (1)(1),
-        (-3)(-1) - (1)(2),
-        (-3)(1) - (4)(2)
-    \rangle \\
-    & = \langle
-        -5, -5, -11
-    \rangle
-\end{align*}
-              '
-					  >3. Cross Product</a>
-					</li>
-
-          <li>
-            <a
-              href='#'
-              class='example'
-              data-text="
-\text{Derivative Rules} \\
-
-\begin{align*}
-% sum/difference rule
-\frac{\text{d}}{\text{d}x} \,
-f(x) \pm g(x) &=
-\frac{\text{d}}{\text{d}x} \, f(x) \pm
-\frac{\text{d}}{\text{d}x} \, g(x) &
-\text{Sum/Difference Rule} \\
-
-% constant factor rule
-\frac{\text{d}}{\text{d}x} \,
-k f(x) &=
-k \frac{\text{d}}{\text{d}x} \, f(x) &
-\text{Constant Factor Rule} \\
-
-% constant rule
-\frac{\text{d}}{\text{d}x} \,
-k &=
-0 &
-\text{Constant Rule} \\
-
-% power rule
-\frac{\text{d}}{\text{d}x} \,
-x^n &=
-nx^{n-1} &
-\text{Power Rule} \\
-
-% exponent rule
-\frac{\text{d}}{\text{d}x} \,
-b^x &=
-b^xln(b) &
-\text{Exponent Rule} \\
-
-% chain rule
-\frac{\text{d}}{\text{d}x} \,
-f(g(x)) &=
-% (f \cdot g)(x) &=
-f'(g(x))g'(x) &
-\text{Chain Rule} \\
-
-% product rule
-\frac{\text{d}}{\text{d}x} \,
-f(x)g(x) &=
-f'(x)g(x) + f(x)g'(x) &
-\text{Product Rule} \\
-
-% quotient rule
-\frac{\text{d}}{\text{d}x} \,
-\frac{f(x)}{g(x)} &=
-\frac{f'(x)g(x) - f(x)g'(x)}{g(x)^2} &
-\text{Quotient Rule} \\
-
-% logarithm rule
-\frac{\text{d}}{\text{d}x} \,
-log_b{x} &=
-\frac{1}{x ln(b)} &
-\text{Logarithm Rule} \\
-
-\end{align*}
-"
-            >4. Derivative Rules</a>
-          </li>
-
-          <li>
-            <a
-              href='#'
-              class='example'
-              data-text="
-% https://math.vanderbilt.edu/schectex/courses/cubic/
-\text{The Cubic Formula} \\
-\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*}
-  "
-            >5. Cubic Formula</a>
-          </li>
-          <li>
-            <a
-              href='#'
-              class='example'
-              data-text="
-\text{Linear Regression} \\
-
-\begin{align*}
-  m &= \frac{
-    \sum(x_i - \bar{x})(y_i - \bar{y}	)
-  }{
-    \sum(x_i - \bar{x})^2
-  } \\
-
-  b &= \bar{y} - m\bar{x} \\
-
-  y &= mx + b
-\end{align*}
-              "
-            >6. Linear Regression</a>
-          </li>
-          <li class='divider'></li>
         </ul><!-- dropdown-menu -->
       </div><!-- btn-group -->
 
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