EQ=DSQRT(RR*RR+RJ*RJ)
DEL=DATAN2(RJ,RR)
SIND=DSIN(DEL)
COSD=DCOS(DEL)
BID=BIX*SIND-BIY*COSD
BIQ=BIX*COSD+BIY*SIND
VD=VT*SIND
VQ=VT*COSD
EVDEL=DEL+VDEL
SIND=DSIN(EVDEL)
COSD=DCOS(EVDEL)
VX=VT*DCOS(VDEL)
VY=VT*DSIN(VDEL)
BIX=BID*SIND+BIQ*COSD
BIY=-BID*COSD+BIQ*SIND
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