cos*(x/2)=0.9

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Solution for cos*(x/2)=0.9 equation: 


(x^3-(2*x)+1)/((-x)^3+3*x) = 0

(x^3-(2*x)+1)*((-x)^3+3*x) = 0

1;2;1;6;0;0

{root[5][22500]}

1/16 = 4/a

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