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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
cos(22) = 9.55/x // - 9.55/x
cos(22)-(9.55/x) = 0
cos(22)-9.55*x^-1 = 0
-9.55*x^-1 = -cos(22) // : -9.55
x^-1 = 0.10471204*cos(22)
-1 < 0
1/(x^1) = 0.10471204*cos(22) // * x^1
1 = 0.10471204*cos(22)*x^1 // : 0.10471204*cos(22)
9.55000017*(cos(22))^-1 = x^1
x = 9.55000017*(cos(22))^-1
x = 9.55000017*(cos(22))^-1
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