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【单选题】
Which of the following is NOT the reason why the birth of eel animation is a milestone?A.
Because it reduced the work and raised the efficiency.
B.
Because cartoonist no longer need to draw backgrounds again.
C.
Because divided work among cartoonists was established.
D.
Because it made cartoonists become workers on a production line in a factory.
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【简答题】设a∈R， f(x)=cosx(asinx-cosx)+co s 2 ( π 2 -x) 满足 f(- π 3 )=f(0) ， （Ⅰ）求函数f（x）的单调递增区间； （Ⅱ）设△ABC三内角A，B，C所对边分别为a，b，c且 a 2 + c 2 - b 2 a 2 + b 2 - c 2 = c 2a-c ，求f（x）在（0，B]上的值域．
【简答题】设函数f(x)满足：f(-x)=-f(x)，且在区间(0，+∞)内，f"(x)＞0． 则f(x)在(-∞，0)内是( )． (A)凹的 (B)凸的 (C)可能是凹的也可能是凸的 (D)以上都不对
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