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D( p )
(0.0475/2+1)^2 = 0
(0.0475/2+1)^2 = 0
(0.0475/2+1)^2 = 0
1.02375^2 = 0
p belongs to the empty set
p in (-oo:+oo)
p = 5.5*(7000/((0.0475/2+1)^2)) // - 5.5*(7000/((0.0475/2+1)^2))
p-(5.5*(7000/((0.0475/2+1)^2))) = 0
p-38500*(0.0475/2+1)^-2 = 0
p-38500*1.02375^-2 = 0 // + -38500*1.02375^-2
p = -(-38500*1.02375^-2)
p = 38500*1.02375^-2
p = 38500*1.02375^-2
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