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x in (-oo:+oo)
P = 3.14*(7/5)*t^2 // - 3.14*(7/5)*t^2
P-(3.14*(7/5)*t^2) = 0
P-4.396*t^2 = 0
P-4.396*t^2 = 0
x należy do R
x in (-oo:+oo)
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