cos(39)=d/30

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Solution for cos(39)=d/30 equation: 


d in (-oo:+oo)

cos(39) = d/30 // - d/30

cos(39)-(d/30) = 0

cos(39)-1/30*d = 0 // - cos(39)

-1/30*d = -cos(39) // : -1/30

d = -cos(39)/(-1/30)

d = 30*cos(39)

d = 30*cos(39)

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