Question: Show that Equation (2.31) can be approximated by Equation (2.33) at sufficiently low frequencies. exp(x) 1 + x when |x| < < 1.

Show that Equation (2.31) can be approximated by Equation (2.33) at sufficiently low frequencies. 

exp(x) ≈ 1 + x when |x| << 1.

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