Differentiate the given expansion of f term-by-term to obtain the corresponding series expansion for the derivative of f. If f (ac) = 1+2x = ((-1)2 2" acn) n = ( f' (2) =? O E ((-1)"2" na -1) n = 1 O ((- 1) n+1 (n + 1 ) 2 2n ) n = 1 O ( ( -1 ) " 2n+ 1 ( n + 1 ) an+ 1 ) n =1