已知向量a=（sinθ，-2)与向量b（1，cosθ）互相垂直，其中θ已知向量a=（sinθ,-2）与向量b=（1，cosθ）
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因为向量垂直，所以向量a*b=0,即sinθ-2cosθ=0,得tanθ=2.
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