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Wrap with (..).n() at the appropriate stage eg:

(vector([cos(rd(40)),sin(rd(40))])*60).n()
(45.9626665871387, 38.5672565811924)

or:

v=(vector([cos(rd(40)),sin(rd(40))])*60).n();v
(45.9626665871387, 38.5672565811924)

then:

v.norm()
60.0000000000000