[Tugindia] formula and calculations

[H.S.Rai]

Is there some trick / wayout or addon, by which formula written in
LaTeX may be evaluated by substituting values. i.e. can we take
advantage of LaTeX formula to perform calculations.

For example:

If if have a=2 and b=4

and LaTeX formula:

c = a^2 + b^2

should be used as such as used normaly in LaTeX to display formula and
then it should substitute values and do calculation automatically
like:

 c = 2^2 + 4^2
 c = 20

With regards,

-- 
H.S.Rai