R=-as2 sin sh-sh SIn √2 sh-sh 0.765 0.8038 Q,=bQ. cos ch-sh Q·cos 4 4 √2 chI-sh 0.765 1.62671 1 1 1 sin sin 4 4 c c a sh sh N             − = −  = −                   1 1 2 1 2 2 0.765 2 sh sh   −   = −           = −0.8038 1 1 1 1 cos cos 4 4 c c b ch sh N            −  =  =                   1 1 2 1 2 2 0.765 2 ch sh   −   =           =1.6267