... 26 and 27 : o lac = 0 x A B cos 0 + 0 y B C sin 0 + t xy A B cos 0 + t xy BC cos 0 ( 7.26 ) 0 1 = 0 x cos 0 2 + o y sin 0 2 + 2 + xy sin 0 cos 0 ( 7.27 ) ...
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