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x in (-oo:+oo)
D = 9.8*(1/2)*t^2 // - 9.8*(1/2)*t^2
D-(9.8*(1/2)*t^2) = 0
D-4.9*t^2 = 0
D-4.9*t^2 = 0
x należy do R
x in (-oo:+oo)
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