若cosa+2sina=-√ 5,则tana=?为什么,cosa+2sina=-√ 5 与 sin^2+cos^2=1联立,得到(√ 5sina+2)^2=0并且为什么最后求得的sin值和cos值是负数呢?
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![若cosa+2sina=-√ 5,则tana=?为什么,cosa+2sina=-√ 5 与 sin^2+cos^2=1联立,得到(√ 5sina+2)^2=0并且为什么最后求得的sin值和cos值是负数呢?](/uploads/image/z/12512453-5-3.jpg?t=%E8%8B%A5cosa%2B2sina%3D-%E2%88%9A+5%2C%E5%88%99tana%3D%3F%E4%B8%BA%E4%BB%80%E4%B9%88%2Ccosa%2B2sina%3D-%E2%88%9A+5+%E4%B8%8E+sin%5E2%2Bcos%5E2%3D1%E8%81%94%E7%AB%8B%2C%E5%BE%97%E5%88%B0%28%E2%88%9A+5sina%2B2%29%5E2%3D0%E5%B9%B6%E4%B8%94%E4%B8%BA%E4%BB%80%E4%B9%88%E6%9C%80%E5%90%8E%E6%B1%82%E5%BE%97%E7%9A%84sin%E5%80%BC%E5%92%8Ccos%E5%80%BC%E6%98%AF%E8%B4%9F%E6%95%B0%E5%91%A2%3F)
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