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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(28) = 6.9/x // - 6.9/x
sin(28)-(6.9/x) = 0
sin(28)-6.9*x^-1 = 0
-6.9*x^-1 = -sin(28) // : -6.9
x^-1 = 0.14492754*sin(28)
-1 < 0
1/(x^1) = 0.14492754*sin(28) // * x^1
1 = 0.14492754*sin(28)*x^1 // : 0.14492754*sin(28)
6.89999982*(sin(28))^-1 = x^1
x = 6.89999982*(sin(28))^-1
x = 6.89999982*(sin(28))^-1
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