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Parametrisierte Kurvenschar

f(x,y) = 5 arcsin(sin(4x)) arcsin(sin(4y)) a(t) = cos(2pi t) b(t) = sin(2pi t) r(t) = c k /(1+exp(-f(a(t),b(t))) x(t) = a(t) - r(t) b'(t) /sqrt(a'(t)²+b'(t)²) y(t) = b(t) +r(t) a'(t)/sqrt(a'(t)²+b'(t)²)