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D( T )
T = 0
T = 0
T = 0
T in (-oo:0) U (0:+oo)
5760/T-((7*T)/4) = 18 // - 18
5760/T-((7*T)/4)-18 = 0
(-7/4)*T+5760/T-18 = 0
5760*T^-1-7/4*T^1-18*T^0 = 0
(5760*T^0-7/4*T^2-18*T^1)/(T^1) = 0 // * T^2
T^1*(5760*T^0-7/4*T^2-18*T^1) = 0
T^1
(-7/4)*T^2-18*T+5760 = 0
(-7/4)*T^2-18*T+5760 = 0
DELTA = (-18)^2-(4*5760*(-7/4))
DELTA = 40644
DELTA > 0
T = (40644^(1/2)+18)/(2*(-7/4)) or T = (18-40644^(1/2))/(2*(-7/4))
T = -2/7*(6*1129^(1/2)+18) or T = -2/7*(18-6*1129^(1/2))
T in { -2/7*(6*1129^(1/2)+18), -2/7*(18-6*1129^(1/2))}
T in { -2/7*(6*1129^(1/2)+18), -2/7*(18-6*1129^(1/2)) }
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