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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(18)/6 = sin(90)/x // - sin(90)/x
sin(18)/6-(sin(90)/x) = 0
-sin(90)*x^-1 = -(sin(18)/6) // : -sin(90)
x^-1 = (sin(18)/6)/sin(90)
-1 < 0
1/(x^1) = (sin(18)/6)/sin(90) // * x^1
1 = ((sin(18)/6)/sin(90))*x^1 // : (sin(18)/6)/sin(90)
6*sin(90)*(sin(18))^-1 = x^1
x = 6*sin(90)*(sin(18))^-1
x = 6*sin(90)*(sin(18))^-1
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