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x in (-oo:+oo)
A = (3.14*S*r^2)/360 // - (3.14*S*r^2)/360
A-((3.14*S*r^2)/360) = 0
A-0.00872222*S*r^2 = 0
A-0.00872222*S*r^2 = 0
x należy do R
x in (-oo:+oo)
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