| CommandJoin fractions Expression
  
 A sum comprising 2 terms.  The 1st  term of the sum  is equal to  a rational expression: the numerator of the rational expression is  negative two.   The denominator of the rational expression is a product that consists of 2 factors.  The 1st  factor of the product  is equal to  s.  The 2nd  factor of the product  is  a sum that consists of 3 terms.  The 1st  term of the sum  is equal to  a power.  The base is s.  The exponent is two.   The 2nd  term of the sum  is   negative s.  The 3rd  term of the sum  is   negative six.   The 2nd  term of the sum  is equal to  a fraction: the top of the fraction is a sum that comprises 2 terms.  The 1st  term of the sum  is equal to  s.  The 2nd  term of the sum  is equal to  one.   The bottom of the fraction is a sum containing 3 terms.  The 1st  term of the sum  is  a power.  The base is s.  The exponent is two.   The 2nd  term of the sum  is equal to   negative s.  The 3rd  term of the sum  is   negative six.negative two  over s times open brace s to the power two  plus  negative s plus  negative six  close brace plus s plus one  over s exponentiated by two  plus  negative s plus  negative six;
 Result
  
 A quotient: dividend of the quotient is a sum that comprises 2 terms.  The 1st  term of the sum  is equal to  s.  The 2nd  term of the sum  is equal to   negative one.   Divisor of the quotient is a product of 2 factors.  The 1st   factor of the product   is equal to  a sum that comprises 2 terms.  The 1st  term of the sum  is equal to  s.  The 2nd  term of the sum  is   negative three.   The 2nd  factor of the product  is equal to  s.s plus  negative one  divided by open parenthesis s plus  negative three   close parenthesis times s.
 
 
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