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若向量a=(cosα,sinα),b=(cosβ,sinβ),则a与b一定满足(...
若向量a=(cosα,sinα),b=(cosβ,sinβ),则a与b一定满足( )
A.a与b的夹角等于α-β
B.(a+b)⊥(a-b)
C.a∥b
D.a⊥b
考点分析:
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