Hi everyone

sage: R.<r,p>=RR[]
sage: rvec=vector([r*cos(p),r*sin(p)])
sage: rr=rvec.norm()
sage: rr.simplify_full()
sqrt((abs(cos(p))^2 + abs(sin(p))^2)*abs(r)^2)

which must gives me: r
How can I define real valued vector?
or How can I withdraw abs() function from norm?

Ubuntu 13.10
Sage Version 6.1.1, Release Date: 2014-02-04

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