Step1: (limit $Δs$ tends to $0$) (Summation $n=1$ to $\infty$) $\cos(nΔs(t-x)) Δs$
Step2 (Integration from $0$ to $\infty$) $\cos(s(t-x)) ds$
How is Step1 equal to Step2?
Step1: (limit $Δs$ tends to $0$) (Summation $n=1$ to $\infty$) $\cos(nΔs(t-x)) Δs$
Step2 (Integration from $0$ to $\infty$) $\cos(s(t-x)) ds$
How is Step1 equal to Step2?
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