kill(all)$

van=facebook.com/LearningCalculus$

a:2*cos(%pi/7)$
b:2*sin(%pi/14)$

p(u,v):=1/u^2-u^2+u^2*v^2 - 1/(u^2*v^2) + 1/v^2 - v^2;

P(u,v):=''(fullratsimp(p(u,v)));

P(x,y);

P(a,b);

trigrat(%);

float(a);

float(b);