ℱ[f(t)/t^2]=1/(2π)F(ω)**ℱ(1/t)
ℱ(1/t)=F2(ω)= πω (ω0)
F(ω)**ℱ(1/t)=(-∞,+∞)∫F(τ)*F2(ω-τ)dτ
=-π(-∞,ω)∫τF(τ)dτ+π(ω,+∞)∫τF(τ)dτ
ℱ[f(t)/t]=j/2*[-(-∞,ω)∫τF(τ)dτ+(ω,+∞)∫τF(τ)dτ]