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$\cos \left(\phi \right)$

$P$

$U_{RL},U_{RC},U_{LC},U_{CD}$

$u_{RL}, u_{RC}, u_{LC}, u_{CD}$

$U_{0RL},U_{0RC},U_{0LC},U_{0CD}$

${\phi }_{RL}, {\phi }_{RC}, {\phi }_{LC}, {\phi }_{CD}$

${\phi }_R, {\phi }_L, {\phi }_C$

${\phi }_u, {\phi }_i, \phi$

$U_{0R}, U_{0L}, U_{0R}$

$U_R, U_L, U_C$