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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(40) = 12/x // - 12/x
sin(40)-(12/x) = 0
sin(40)-12*x^-1 = 0
-12*x^-1 = -sin(40) // : -12
x^-1 = sin(40)/12
-1 < 0
1/(x^1) = sin(40)/12 // * x^1
1 = (sin(40)/12)*x^1 // : sin(40)/12
12*(sin(40))^-1 = x^1
x = 12*(sin(40))^-1
x = 12*(sin(40))^-1
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