下列命题中(1)若 f(x)=2co s 2 x 2 -1 ,则f(x+π)=f(x)对?x∈R恒成立. (2)△ABC中,A>B是sinA>sinB的充要条件. (3)若 a , b , c 为非零向量,且 a ? b = a ? c ,则 b = c (4)要得到函数 y=sin x 2 的图象,只需将函数 y=sin( x 2 - π 4 ) 的图象向右平移 π 2 个单位,其中真命题的有______.
【单选题】When a company combines with firms in different and dissimilar industries, it indulges in ________. A) unrelated diversification B) vertical integration C) stabilized diversification D) horizontal int...