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∞If ∫ sin^2 (f) / (f)^2 df =π
-∞
∞and ∫ sin^2 (πf) / (πf)^2 df = 1
-∞
Then does
∞
∫ sin^2 (πfT) / (πfT)^2 df = 1/T
-∞