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+ subroutine g2 (cos,sin,x,y)
+c c.l.lawson and r.j.hanson, jet propulsion laboratory, 1972 dec 15
+c to appear in 'solving least squares problems', prentice-hall, 1974
+c apply the rotation computed by g1 to (x,y).
+ xr=cos*x+sin*y
+ y=-sin*x+cos*y
+ x=xr
+ return
+ end