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Use the product rule and:
OKay, but i dont know how to derivate that factorial stuff
You are only taking the derivative with respect to x, k! is constant.
Then it is only kx^k-1 /k!?
Originally Posted by gotmejerry Then it is only kx^k-1 /k!? is correct, however, you can use your definition of a factorial to cancel a factor of k giving
But don't forget your other term and use the product rule
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