1. Let f be a smooth function on R. (a) If f" ＞ 0 on R, then f' must.be increasing on R. (b) If f" ＞ 0 on R, then f must be concave upward on R. (c) If f"(a) = 0, then the point (a, f(a)) must be an infection point. Among the above three statements, how many of them are true? (A)Only one.(B) Only two. (C)All of them. (D) None of them.

複選題2. A function f on R is odd if f(-x)"=-f(x) for all xR while it is even if f(-x) = f(x) for all x R. Suppose that g and h are two functions on R. (a) If g is an even function, then the composite function h o g must be even. (b) If g is an odd function and , then the limit must be -3.(c) If g is an even function and , then the limit must be 3.Among the above three statements, how many of them are true? (A)Only one.(B) Only two. (C)All of them. (D) None of them.

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