is L is the operator, and v is the function and x is the eigen value, then
Lv=xv.
a) We can see than
if v=e^(-kx),
Lv=-ke^(-kx)=-kx
so, x=-k
so the eigen value is -k
b)for cos(kx) function,
L2v=-k^2cos(kx)=-k^2v
so the eigen value is -k^2
if v=e^-kx,
L2v=k^2e^(-kx)
so, x=k^2
so the eigen value is k^2
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