kill(all)$

van=facebook.com/LearningCalculus$

     Continued Fractions

cf([1,2,3]);

cfdisrep(%);

eqn: y^2-x^2=1;

depends(y,x);

foo:diff(eqn,x);

solve(foo,'diff(y,x));

step0:y+x=2*x+1/(x+y);

step1:(y+x-2*x)*(y+x)=1;

step2:expand(step1);