已知向量a=(sinθ,cosθ-2sinθ),b=(1.2)1)若向量a平行向量b,求tanθ的值.(2)若|向量a|=|向量b|,0
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![已知向量a=(sinθ,cosθ-2sinθ),b=(1.2)1)若向量a平行向量b,求tanθ的值.(2)若|向量a|=|向量b|,0](/uploads/image/z/1812632-32-2.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%28sin%CE%B8%2Ccos%CE%B8-2sin%CE%B8%29%2Cb%3D%281.2%291%29%E8%8B%A5%E5%90%91%E9%87%8Fa%E5%B9%B3%E8%A1%8C%E5%90%91%E9%87%8Fb%2C%E6%B1%82tan%CE%B8%E7%9A%84%E5%80%BC.%282%29%E8%8B%A5%7C%E5%90%91%E9%87%8Fa%7C%3D%7C%E5%90%91%E9%87%8Fb%7C%2C0)
已知向量a=(sinθ,cosθ-2sinθ),b=(1.2)1)若向量a平行向量b,求tanθ的值.(2)若|向量a|=|向量b|,0
已知向量a=(sinθ,cosθ-2sinθ),b=(1.2)
1)若向量a平行向量b,求tanθ的值.
(2)若|向量a|=|向量b|,0<θ<π,求θ的值.
已知向量a=(sinθ,cosθ-2sinθ),b=(1.2)1)若向量a平行向量b,求tanθ的值.(2)若|向量a|=|向量b|,0
已知向量a=(sinθ,cosθ-2sinθ),b=(1.2)
1)若向量a平行向量b,求tanθ的值.
∴sinθ/1=(cosθ-2sinθ)/2;
2sinθ=cosθ-2sinθ;
4sinθ=cosθ;
∴tanθ=sinθ/cosθ=1/4;
(2)若|向量a|=|向量b|,0