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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(70) = 8/x // - 8/x
sin(70)-(8/x) = 0
sin(70)-8*x^-1 = 0
-8*x^-1 = -sin(70) // : -8
x^-1 = sin(70)/8
-1 < 0
1/(x^1) = sin(70)/8 // * x^1
1 = (sin(70)/8)*x^1 // : sin(70)/8
8*(sin(70))^-1 = x^1
x = 8*(sin(70))^-1
x = 8*(sin(70))^-1
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