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x in (-oo:+oo)
36 = 3.14*d^2*(l/4) // - 3.14*d^2*(l/4)
36-(3.14*d^2*(l/4)) = 0
36-0.785*d^2*l = 0
36-0.785*d^2*l = 0
x należy do R
x in (-oo:+oo)
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