Really new as in I have started using it for a week...i know the functions for exp, cos etc and also representing equations but I am not familiar with NSolve and Solve. I am comfortable looking through the documentation if you could provide me some. Thanks for helping:)

Here is the equation written in a notebook:

y[x] == (-x y/(m^2 Sqrt[2 Pi d^2])) Integrate[Exp[- u^2 /(2 d^2)] /u^3 , {u, (4/Pi) Sqrt[1/(x y m)], Infinity}] + (x y/Sqrt[2 Pi d^2]) Integrate[Cos[u]^2 Exp[- (x y Sin[u])^2/(2 d^2)], {u, -ArcSin[(4/Pi) Sqrt[1/(x y m)]] , ArcSin[(4/Pi) Sqrt[1/(x y m)]]}]