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D( x )
2*x-180 = 0
2*x-180 = 0
2*x-180 = 0
2*x-180 = 0 // + 180
2*x = 180 // : 2
x = 180/2
x = 90
x in (-oo:90) U (90:+oo)
(2*60*120*x)/(2*x-180) = 0
(14400*x)/(2*x-180) = 0
14400*x = 0 // : 14400
x = 0
x = 0
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