Cos18=25/x

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Solution for Cos18=25/x equation: 


(-x)^2-(3*x)+10 = 0

65;5

2*x^2+x+1 = 0

x^2-(4*x)+4 = 0

4*x^4+3*x^2+0*x^3+0*x-1 = 0

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