III-7) est obtenue en combinant l'équation (I-I 1) et les équàtions (A-I-Z), (A-1-3) et (A-1-4) , et en utilisant I'identité coS39, pp.4-6 ,
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A -1)-(k / 3)(B-l)(B +t)+(z'l2/m)*[rt'(n -l)a-rto Èl ,
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