simple equation

[urban]

i need help with this one
(1-h^2*r^2*1.1)tg(h*r)=h*r
i need analyitical solution. r = 6371
or any help how to solve this...

[vsage]

new format please. I am not sure what tg are if they are not constants.

[Tide]

If tg is tangent then I don't think Urban will find an analytical solution!

[urban]

tg stands for tangens...

[arildno]

One solution is h=0..