1. The problem statement, all variables and given/known data
...I can't view the picture...try re-upping it as a jpeg or something so
I re-upload the pic. The integration is that ∫cos(kx)exp[(-αt)K^2] dkfrom zero to infinity
Convert cos(kx) to (exp(ikx)+exp(-ikx))/2. Combine the exponentials and complete the squares in the exponents. Now do a change of variable and use the known result for exp(-Cx^2).
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