D Question 1 1 pts The derivative of f is defined as f (x) = limp- f(ath)-f(2) O True O False D Question 2 1 pts Given the graph of a function f, if the tangent line at a point P (a, f (a)) is falling from left to right, then f' (a) is positive. O True O False D Question 3 1 pts Given the graph of a function f, if the tangent line at a point P (a, f (a)) is horizontal, then f ' (a) is zero. O True O False D Question 4 1 pts ( x th) = 23 + 3x2 h+Gach2+ 3 O True O False D Question 5 1 pts In limp-+0 (3x2 + 3xh + h2 - 1), x is regarded temporarily as a constant during the calculation of the limit. O True O False D Question 6 1 pts If f (x) = va, then the domain of the derivative of the function of is (0, co). O True O False