28. 1 using differentiation of f(x) = o , the power series of f(x) is given by f(x) = >(d-1)"x (b) f(x) = (n+2)-1)" x" 8n:2 (a) 8n+2 (b) n=0 n-0 (c) f(x) = (n+

28. 1 Using differentiation of f(x) = o , the power series of f(X) is given by f(x) = >(D-1)"x (B) f(x) = (n+2)-1)" x" 8n:2 (A) 8n+2 (B) n=0 n-0 (C) f(x) = (n+ 1)(-1)"x" f(x) = °+1)(-1)" x 8n+1 8n+2 (D) n=0 n=0