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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(2-y)/y = 8.85 // - 8.85
(2-y)/y-8.85 = 0
(2-y)/y+(-8.85*y)/y = 0
2-y-8.85*y = 0
2-9.85*y = 0
(2-9.85*y)/y = 0
(2-9.85*y)/y = 0 // * y
2-9.85*y = 0
2-9.85*y = 0 // - 2
-9.85*y = -2 // : -9.85
y = -2/(-9.85)
y = 0.20304569
y = 0.20304569
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