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D( x )
8*x = 0
8*x = 0
8*x = 0
8*x = 0 // : 8
x = 0
x in (-oo:0) U (0:+oo)
3 = (1.7*180*180)/(8*x) // - (1.7*180*180)/(8*x)
3-((1.7*180*180)/(8*x)) = 0
3-6885*x^-1 = 0
-6885*x^-1 = -3 // : -6885
x^-1 = 1/2295
-1 < 0
1/(x^1) = 1/2295 // * x^1
1 = 1/2295*x^1 // : 1/2295
2295 = x^1
x = 2295
x = 2295
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