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x in (-oo:+oo)
A = (1/2)*r^2*y // - (1/2)*r^2*y
A-((1/2)*r^2*y) = 0
A+(-1/2)*r^2*y = 0
A-1/2*r^2*y = 0
x należy do R
x in (-oo:+oo)
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