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