几道三角函数基础题1)若tana>0,角a的集合是2)tana=-3/4,求(2cosa+3sina)/(3cosa+sina)3)sina+cosa=1/5,a属于(0,π),则tana=
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![几道三角函数基础题1)若tana>0,角a的集合是2)tana=-3/4,求(2cosa+3sina)/(3cosa+sina)3)sina+cosa=1/5,a属于(0,π),则tana=](/uploads/image/z/12871714-58-4.jpg?t=%E5%87%A0%E9%81%93%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E5%9F%BA%E7%A1%80%E9%A2%981%29%E8%8B%A5tana%3E0%2C%E8%A7%92a%E7%9A%84%E9%9B%86%E5%90%88%E6%98%AF2%29tana%3D-3%2F4%2C%E6%B1%82%282cosa%2B3sina%29%2F%283cosa%2Bsina%293%29sina%2Bcosa%3D1%2F5%2Ca%E5%B1%9E%E4%BA%8E%280%2C%CF%80%29%2C%E5%88%99tana%3D)
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