A test function as part of the integrand is required to prove any delta function identity. With

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A test function as part of the integrand is required to prove any delta function identity. With this in mind:

(a) Prove that δ(ax) = 1/|a|δ(x), a ≠ 0.

(b) Use the identity in part (a) to prove that

(c) Confirm that

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