(三角函数)1.sin330+cos240=?(不用过程)2.角b的终边经过点P(t,2t),则sinb=?(不用过程)3.已知cos∝+2sin∝=负根号5,求tan∝的值.(要写过程)
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![(三角函数)1.sin330+cos240=?(不用过程)2.角b的终边经过点P(t,2t),则sinb=?(不用过程)3.已知cos∝+2sin∝=负根号5,求tan∝的值.(要写过程)](/uploads/image/z/4080653-53-3.jpg?t=%EF%BC%88%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%EF%BC%891.sin330%2Bcos240%3D%3F%28%E4%B8%8D%E7%94%A8%E8%BF%87%E7%A8%8B%292.%E8%A7%92b%E7%9A%84%E7%BB%88%E8%BE%B9%E7%BB%8F%E8%BF%87%E7%82%B9P%28t%2C2t%29%2C%E5%88%99sinb%3D%3F%28%E4%B8%8D%E7%94%A8%E8%BF%87%E7%A8%8B%293.%E5%B7%B2%E7%9F%A5cos%E2%88%9D%2B2sin%E2%88%9D%3D%E8%B4%9F%E6%A0%B9%E5%8F%B75%2C%E6%B1%82tan%E2%88%9D%E7%9A%84%E5%80%BC.%28%E8%A6%81%E5%86%99%E8%BF%87%E7%A8%8B%29)
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