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## Homework Statement

Hi ,

I am reading a little on introductory QM , initial chapters on waves.

They have given an integral for a wavepacket , assuming at t= 0.

Which is: ψ(x,0) = [itex]\int A cosk'x dk'[/itex] (I don't know how to define limits to the integral in Latex upper = k+Δk , lower limit = k-Δk)

which gives ψ(x,0) = S(x)coskx , where S (x) = 2AΔK sin(Δkx)/(Δkx).

## Homework Equations

Integration by parts ?

## The Attempt at a Solution

Now I am totally brain stuck , it surely can't be anything complex so I should be able to do it by parts.

Let u =cosk'x and dv = dk'

Or am I overlooking something ?