Quotientenregel : \(({u \over v})´= {vu´-uv´ \over v^2}\); \( u=a-d \); \( u ´=0 \); \( v= 1+({x \over c})^b\) ; \(v´={b \over c} ({x \over c})^{b-1}\)
\(f(x)´ = [{(a-d) \over 1 +( {x \over c})^b}+D]´= -{(a-d)* {b \over c} ({x \over c})^{b-1} \over (1+ ({x \over c})^b)^2}\)
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