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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
sin(58) = 8.1/X // - 8.1/X
sin(58)-(8.1/X) = 0
sin(58)-8.1*X^-1 = 0
-8.1*X^-1 = -sin(58) // : -8.1
X^-1 = 0.12345679*sin(58)
-1 < 0
1/(X^1) = 0.12345679*sin(58) // * X^1
1 = 0.12345679*sin(58)*X^1 // : 0.12345679*sin(58)
8.10000001*(sin(58))^-1 = X^1
X = 8.10000001*(sin(58))^-1
X = 8.10000001*(sin(58))^-1
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