help re-arranging a complex formula

Hi,

I'm having some trouble rearranging the formula below in terms of t, i'm sure its much easier than I think but if would be great if i could be pointed in the right direction. Its been a while since I've had to do something like this so im quite rusty!

http://i176.photobucket.com/albums/w...h/formula1.gif

I've got several equations like this which i wil need to arrange and im wondering if it can be done in Mathcad, which I have but im not familer with?

any help much appreciated

mark