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Atan2

Function: atan2 (<y>, <x>) - yields the value of atan(<y>/<x>) in the interval -%pi to %pi.

bZ12:1000;
aZ12:9.81*%PI/180;
g:bZ12=sqrt((rZ12^2)+(iZ12^2));
g1:aZ12=atan2(iZ12,rZ12);
solve([g,g1],[rZ12,iZ12]),numer;

(%o1)                                true
(%i2) 

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