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@k³l@ƒÆm = (1/2)tan-1{2.01(ft2+ftƒÐpm)1/2/ƒÐpm}
@@@@@ƒÆd = (1/2)tan-1{2.01(ft2+ftƒÐpd)1/2/ƒÐpd}
@kŒël@ƒÆm = (1/2)tan-1{(ft2+ftƒÐpm)1/2/ff}
@@@@@ƒÆd = (1/2)tan-1{(ft2+ftƒÐpd)1/2/ft}