[Axapta-Knowledge-Village] Help On A Calculation With An Exponent.

[Girac]

I have the following calculation I am trying to do:
T = (1-((1/(1+I))^n)/I)*((1+I)/I*30)/(1+(I*DFP)/30);
I do not get the proper result returned to me. 
When I try a T=N^2; where N=60, I get a 62 returned. 
How would I use an exponent in X++.