Question: How can you choose from a case-by-case result?

If you have several results, e.g. one being real, the others complex. How can you choose?


G := 6.673*10^(-11):

M := 1.9891*10^30:

AU := 1.4959787066*10^11:

v := proc (R) options operator, arrow; 2332800000/(Pi*(R^3*AU^3/(G*M))^.5) end proc;

proc (R) options operator, arrow; 2332800000/(Pi*(R^3*AU^3/(G*M))^.5) end proc

(1)

a := solve(.601 = 60*(360*60)/(2*Pi*((R*AU)^3/(G*M))^.5)*3600, R);

39.26171595, -19.63085797+34.00164341*I, -19.63085797-34.00164341*I

(2)

op(1, a)

Error, invalid input: op expects 1 or 2 arguments, but received 4

 

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