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function [Rab,Rbc,Rca]=star_to_delta(Ra,Rb,Rc)
X=Ra*Rb+Rb*Rc+Rc*Ra
Rab=X/Rc
Rbc=X/Ra
Rca=X/Rb
endfunction
function p=parallel(r1,r2)
p=r1*r2/(r1+r2)
endfunction
[Rx,Ry,Rz]=star_to_delta(8,4,2)
Req_ad=parallel(parallel(4,Rx)+parallel(12,Rz),parallel(3,Ry))
disp(Req_ad)
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