A[af1(t)+bf2(t)]←→[aF1(jω)*bF2(jω)]
B[af1(t)+bf2(t)]←→[aF1(jω)-bF2(jω)]
C[af1(t)+bf2(t)]←→[aF1(jω)+bF2(jω)]
D[af1(t)+bf2(t)]←→[aF1(jω)/bF2(jω)]
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