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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4*p-((9/4)*p^2)-(((4/p)/9)*p) = 0
(-9/4)*p^2+4*p-4/9 = 0
4*p-9/4*p^2-4/9 = 0
DELTA = 4^2-(-9/4*(-4/9)*4)
DELTA = 12
DELTA > 0
p = (12^(1/2)-4)/(-9/4*2) or p = (-12^(1/2)-4)/(-9/4*2)
p = -2/9*(2*3^(1/2)-4) or p = -2/9*(-2*3^(1/2)-4)
p in { -2/9*(2*3^(1/2)-4), -2/9*(-2*3^(1/2)-4) }
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