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x in (-oo:+oo)
S = 3.14*(1/2)*d^2*z // - 3.14*(1/2)*d^2*z
S-(3.14*(1/2)*d^2*z) = 0
S-1.57*d^2*z = 0
S-1.57*d^2*z = 0
x należy do R
x in (-oo:+oo)
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