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  1. Free excel taining course
    1. https://www.excel-pratique.com/en/course.php
  2. free vba training course 
    1. https://www.excel-pratique.com/en/vba.php
  3. functions explained
    1. https://www.excel-pratique.com/en/functions.php
  4. Practice pythogoras theorom
    1. https://www.excel-pratique.com/en/downloads/mathematical-tools/the-pythagorean-theorem-no66.php
    2. triangle ab c with c as hypotenuse
      1. construct line at rt angle to c to meet angle ab 
      2. therefore line c divided into m and n 
    3. sinx = a / n+m  =  n / a = so = a square = n square + mn  (sinx also e / b - not used)
    4. sin y =  m / b =  b/ n+m  = so = b square = m squae  + nm (sin y =  e / a also not used  
    5. a square + b square = m squar + 2mn + n square  = (m+n) square 
    6. asquare + b square = c square ( as m+n = c)

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