cos(2x)=-7/18

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Solution for cos(2x)=-7/18 equation: 


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

x

2/(3^6)

4/3 = 49.95

3/5 = 2/3

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

x

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