cos(39)=x/2

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Solution for cos(39)=x/2 equation: 


x in (-oo:+oo)

cos(39) = x/2 // - x/2

cos(39)-(x/2) = 0

cos(39)-1/2*x = 0 // - cos(39)

-1/2*x = -cos(39) // : -1/2

x = -cos(39)/(-1/2)

x = 2*cos(39)

x = 2*cos(39)

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