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t in (-oo:+oo)
4*t-((1/4)*t^2) = 0
(-1/4)*t^2+4*t = 0
4*t-1/4*t^2 = 0
DELTA = 4^2-(-1/4*0*4)
DELTA = 16
DELTA > 0
t = (16^(1/2)-4)/(-1/4*2) or t = (-16^(1/2)-4)/(-1/4*2)
t = 0 or t = 16
t in { 0, 16 }
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