# cos(40)=4/x

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## Solution for cos(40)=4/x equation:

D( x )x = 0x = 0x = 0x in (-oo:0) U (0:+oo)cos(40) = 4/x / - 4/xcos(40)-(4/x) = 0cos(40)-4*x^-1 = 0-4*x^-1 = -cos(40) / : -4x^-1 = cos(40)/4-1 < 01/(x^1) = cos(40)/4 / * x^11 = (cos(40)/4)*x^1 / : cos(40)/44*(cos(40))^-1 = x^1x = 4*(cos(40))^-1x = 4*(cos(40))^-1`