cos(64)=x/15

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Solution for cos(64)=x/15 equation: 


x in (-oo:+oo)

cos(64) = x/15 // - x/15

cos(64)-(x/15) = 0

cos(64)-1/15*x = 0 // - cos(64)

-1/15*x = -cos(64) // : -1/15

x = -cos(64)/(-1/15)

x = 15*cos(64)

x = 15*cos(64)

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