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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(1.5) = 5/x // - 5/x
sin(1.5)-(5/x) = 0
sin(1.5)-5*x^-1 = 0
-5*x^-1 = -sin(1.5) // : -5
x^-1 = sin(1.5)/5
-1 < 0
1/(x^1) = sin(1.5)/5 // * x^1
1 = (sin(1.5)/5)*x^1 // : sin(1.5)/5
5*(sin(1.5))^-1 = x^1
x = 5*(sin(1.5))^-1
x = 5*(sin(1.5))^-1
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