Show that Equation 3.89 can be expressed as F ( t ) = 1 2 a 0 + ∑ n = 1 ∞ c n cos ( n ω t − ϕ n ) and relate the coefficients c n to a n and b n .

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Chapter 3, Problem 3.27P

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Show that Equation 3.89 can be expressed as F(t)=12a0+∑n=1∞cncos(nωt−ϕn) and relate the coefficients cn to an and bn.

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