In Wiersema: Brownian Motion Calculus on p. 205 (in an Annex on Moment Generating Functions (mgf)) the following equation is being presented with being a random variable, the mgf-dummy variable and the expectation operator (and for the 'th moment of ).
My question: Why is it possible to pull the term out and in front of the -times differentiation? Could anyone give me a hint or some intermediate steps? Or is this a typo? (Sorry if this is too elementary but I don't get it anyway - and I want to understand this!)
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