<script type="text/javascript" src="cfg/math/mathml.js"></script> 
  <script type="text/javascript">mathfontsize=".9em" 
  <div style="visibility:hidden; position:absolute; p:0px; z-index:-10; width:0; height:0" class="ASCIIMathCalculator"></div> 
  <s>
  
h4 calculator areas:<br> 
  </s>
  <br>
  <br>
  <textarea id="in1" rows="2" cols="28" onkeyup="calculate('in1','out1')"> 
  2sin^-1(1)</textarea> &nbsp; <span id="out1"></span> 
  <br><br> 
  <textarea id="in2" rows="4" cols="28" 
  onkeyup="calculate('in2','out2');calculate('in3','out3')"> 
  a=5; b=4; c=-1; (-b+sqrt(b^2-4a*c))/(2a)
  </textarea> &nbsp; <span id="out2"></span> 
  <s><p><br>
  <textarea id="in3" rows="2" cols="28" 
  onkeyup="calculate('in2','out2');calculate('in3','out3')"> 
  (-b-sqrt(b^2-4a*c))/(2a)</textarea> &nbsp; <span id="out3"></span> 
  </s>
   
  <s>
  <p><br>
  <b>some technical remarks:</b> This calculator works only in radians.
  (Multiply angles by pi/180 to convert from degrees to radians.)
  <br/> 
   
  The syntax is loosely based on JavaScript and a subset of ASCIIMathML.
  <br/> 
  The multiplication symbol * can be omitted after a digit (0-9) 
  or a closing parenthesis.
  <br/> 
  available constants and functions: 
  <br/> 
  &nbsp; &nbsp; +, -, *, /, ^, pi, e, sqrt(), ln(), abs(), sign(), 
  floor(), ceil(), n!, C(n,k), ran(a,b,n)
  <br/> 
  &nbsp; &nbsp; sin(), cos(), tan(), sin^-1(), cos^-1(), tan^-1(), 
  sinh(), cosh(), tanh(), sinh^-1(), cosh^-1(), tanh^-1()
  <br/> 
  &nbsp; &nbsp; sec(), csc(), cot(), sec^-1(), csc^-1(), cot^-1(),
  sech(), csch(), coth(), sech^-1(), csch^-1(), coth^-1()
   
  <br/> 
  Values can be assigned to (legal JavaScript) variable names. 
  Use ";" to separate expressions.
  <br/> 
  Any number of calculator textareas can be placed anywhere on <b>your own</b> 
  webpages.
  <br/>