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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(20) = 14/x // - 14/x
sin(20)-(14/x) = 0
sin(20)-14*x^-1 = 0
-14*x^-1 = -sin(20) // : -14
x^-1 = sin(20)/14
-1 < 0
1/(x^1) = sin(20)/14 // * x^1
1 = (sin(20)/14)*x^1 // : sin(20)/14
14*(sin(20))^-1 = x^1
x = 14*(sin(20))^-1
x = 14*(sin(20))^-1
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