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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = (3*n)/10 // - (3*n)/10
3/n-((3*n)/10) = 0
(-3/10)*n+3/n = 0
3*n^-1-3/10*n^1 = 0
(3*n^0-3/10*n^2)/(n^1) = 0 // * n^2
n^1*(3*n^0-3/10*n^2) = 0
n^1
(-3/10)*n^2+3 = 0
(-3/10)*n^2+3 = 0
DELTA = 0^2-(3*4*(-3/10))
DELTA = 18/5
DELTA > 0
n = ((18/5)^(1/2)+0)/(2*(-3/10)) or n = (0-(18/5)^(1/2))/(2*(-3/10))
n = -5/3*(18/5)^(1/2) or n = 5/3*(18/5)^(1/2)
n in { -5/3*(18/5)^(1/2), 5/3*(18/5)^(1/2)}
n in { -5/3*(18/5)^(1/2), 5/3*(18/5)^(1/2) }
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