ch33-p044 - 44. We note the points at which the curve is...

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44. We note the points at which the curve is zero ( θ 2 = 60 ° and 140 ° ) in Fig. 33-45(b). We infer that sheet 2 is perpendicular to one of the other sheets at 2 = 60 ° , and that it is perpendicular to the other of the other sheets when 2 = 140 ° . Without loss of generality,
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