Use the function fC:.) = (eia. - eil.~ )/:: 2 and the
Chapter 0, Problem 7.28(choose chapter or problem)
Use the function fC:.) = (eia. - eil.~ )/:: 2 and the indented contour in Fig. 108 (Sec. 89) to derive the integration formula l '- COS(CIX) - cos(b.r) ;r ----,---d.\ = -(/J- Cl) (I x- 2 (a :::. 0. b :::. 0 ). Then. with the aid of the lrigonomctric identity I - cos( 2.r) = 2 sin2 x. point out how it fol lows that l '- sin2 x . _ ;r , d.\ - . '(I .r- 2
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