cos(40)=x/13

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Solution for cos(40)=x/13 equation: 


x in (-oo:+oo)

cos(40) = x/13 // - x/13

cos(40)-(x/13) = 0

cos(40)-1/13*x = 0 // - cos(40)

-1/13*x = -cos(40) // : -1/13

x = -cos(40)/(-1/13)

x = 13*cos(40)

x = 13*cos(40)

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