Use residues to establish the following trigonometric integral formula: »2n cos?(30) de = J, 5-4cos(20)) 7.93.3: 8 HINT: Look at formula (7) of Section 93 for how to transform cos(20) into the z variable (it should remind you of de Moivre's formula). Deduce a similar formula for how to transform cos(30). Keep in mind that some singularities don't matter because they are outside the contour of integration (though by my count you still need to compute three

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