已知向量a=(sina,1),向量b=(cosa,2) a∈(0,π/4),(1) 若a‖b,求tana (2)若a·b=17/8,求sin(2a+π/4)的好吧那个方框是数量积,为什么显示不出来啊怨念~
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![已知向量a=(sina,1),向量b=(cosa,2) a∈(0,π/4),(1) 若a‖b,求tana (2)若a·b=17/8,求sin(2a+π/4)的好吧那个方框是数量积,为什么显示不出来啊怨念~](/uploads/image/z/2497419-27-9.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%28sina%2C1%29%2C%E5%90%91%E9%87%8Fb%3D%28cosa%2C2%29+a%E2%88%88%280%2C%CF%80%2F4%29%2C%EF%BC%881%EF%BC%89+%E8%8B%A5a%E2%80%96b%2C%E6%B1%82tana+%282%29%E8%8B%A5a%C2%B7b%3D17%2F8%2C%E6%B1%82sin%282a%2B%CF%80%2F4%29%E7%9A%84%E5%A5%BD%E5%90%A7%E9%82%A3%E4%B8%AA%E6%96%B9%E6%A1%86%E6%98%AF%E6%95%B0%E9%87%8F%E7%A7%AF%EF%BC%8C%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%BE%E7%A4%BA%E4%B8%8D%E5%87%BA%E6%9D%A5%E5%95%8A%E6%80%A8%E5%BF%B5%EF%BD%9E)
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