Cos2x=1/4 - solution

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Solution for Cos2x=1/4 equation:

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(((9*x^2)/(x-4))*(2*x^3-20))/(3*x-4) = 0

X/2-7 = -52

x^2-(0.0166606*x)+0.0000731261 = 0

3*x+2 = 0

y = 1*x^2+3*x-10;1;3;-10

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