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题目内容
(西昌学院高等数学B2)
已知平面向量a=(1,1),b=(1,-1),则两向量的夹角为
(A)π/6
(B)π/4
(C)π/3
(D)π/2
(A)π/6
(B)π/4
(C)π/3
(D)π/2
参考答案