U1 – U2 = – 2k122 – 2k14P – 2k15 ( r – ra ) – 2k177 = ( 57 ) Va = -2k12P – 2k147 – 2k15 ( r – ra ) – 2k17 ( r – ra ) dt for( 58 ) Substitution Eq . ( 47 ) ...
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