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x in (-oo:+oo)
a = (3.14*r^2*s)/360 // - (3.14*r^2*s)/360
a-((3.14*r^2*s)/360) = 0
a-0.00872222*r^2*s = 0
a-0.00872222*r^2*s = 0
x naleu017Cy do R
x in (-oo:+oo)
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