cos(5x/4

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Solution for cos(5x/4 equation: 


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

(4/3)/(-5/9) = 4/3

(5/9)*x^2-((16/15)*x) = 3/2

340/2 = 0

x/5-(x/5) = 1

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