wb9m2 xb9m2x yb9m zb9m2 0b9m2x

l29m2x m29m n29m2 o29m2x p29m

atan btan2 ctan2x dtan etan2

zjbn2 0jbn2x 1jbn 2jbn2 3jbn2x

oacn2x pacn qacn2 racn2x sacn