Example 7-18. Show that eitx =1+ (eit - 1) x(1) + (eit – 1)². T+.. x(2) + (eit – 1)* . r! where xr) = x (x- 1) (x- 2)... (x-r+ 1). Hence show that Ho = [D" ¢(t)]; = 0, where D = d( eit) and H is the rth factorial moment.

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