4cos^2(x/2)-4cos(x/2)-3=0

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Solution for 4cos^2(x/2)-4cos(x/2)-3=0 equation: 


1*x^4+1*x^3-(9*x^2)+3*x-36 = 0

(3/2)*u-3 = (-6/5)*u-(5/2)

(3/2)*u-3 = -6/5-(5/2)

1*x^4+1*x^3-(9*x^2)+3*x-36 = 0

-1/0.5 = 0

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