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Homework Statement
Consider the wave packet [tex]\varphi[/tex](k) = [tex]\int B(k)cos(kx) dk[/tex] from 0 to infinity and B(k) = exp([tex]^{-a^{2}k^{2}}[/tex]). Find [tex]\varphi[/tex](k)
Homework Equations
The Attempt at a Solution
After looking up integral tables, i got an expression involving error function (erf) and imaginary error function (erfi) which i don't know how to continue.