Cos^2(3x)/3Cos^2(x)

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Solution for Cos^2(3x)/3Cos^2(x) equation: 


1*x^4-(10*x^2)+0*x^3+0*x+36 = 0

1*x^4-(5*x^2)+0*x^3+0*x+4 = 0

(3*x)/5 = 7

(3*k-18)/(42-(7*k)) = 0

3*k-(18/(42-(7*k))) = 0

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