49) If f(x) = 23 cos(x3), then Too(x) is 2-3 2! b) 26 c) 23 + e) None of the above 50) If f(a) = 23 cos(23), then f(5)(0) is a) 0 b) 1 c) 3! d) 5! e) f(5) (0) does not exist. 51) If f(x) = x3 cos(x3), then f(9) (0) is e) None of the above1 1'19\"\" 42) The series 2 converges if and only if n=1 a)n:>l _b)cr 1 for all n E N. b) converges by the Ratio Trust. 1'.) diverges by the Limit. Comparison Test with b,I = % d) None of the above. 45) (1)"+'(nTm a) converges absolutely. b) converges conditionally. e) diverges. 11) None of the above