kill(all)$

van=facebook.com/LearningCalculus$

f(x,y,k):=x=log(k-y/sqrt(y^2-1));
g(x,y,k):=y=log(k-x/sqrt(x^2-1));

g(log(k-y/sqrt(y^2-1)),y,k);

h(y):=''(g(log(2007-y/sqrt(y^2-1)),y,2007));

H(y):=float(h(y))$

H(7.603893600884709);

f(x,y,2007);

g(x,y,2007);