cos28=x/4

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Solution for cos28=x/4 equation: 


-5/(4*x)

5-((-(b^2-(12*a))^(1/2)-b)/(2*a));15-(((b^2-(12*a))^(1/2)-b)/(2*a))

1-(25*25*(3.8/75)*(log(10)(x))) = 0

-5/(4*x)

(-5/4)*x

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