1.已知sinα=3/5,α∈(π/2,π),tan(π-β)=1/2,求tan(α-2β)的值.(09北京西城)2.已知已知α是第一象限角,且cosα=5/13,求sin(α+π/4)/cos(2α+4π)的值.(06上海)3.当x∈[-π/2,π/2]时,求函数f(x)=
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![1.已知sinα=3/5,α∈(π/2,π),tan(π-β)=1/2,求tan(α-2β)的值.(09北京西城)2.已知已知α是第一象限角,且cosα=5/13,求sin(α+π/4)/cos(2α+4π)的值.(06上海)3.当x∈[-π/2,π/2]时,求函数f(x)=](/uploads/image/z/12953372-68-2.jpg?t=1.%E5%B7%B2%E7%9F%A5sin%CE%B1%3D3%2F5%2C%CE%B1%E2%88%88%EF%BC%88%CF%80%2F2%2C%CF%80%EF%BC%89%2Ctan%EF%BC%88%CF%80-%CE%B2%EF%BC%89%3D1%2F2%2C%E6%B1%82tan%EF%BC%88%CE%B1-2%CE%B2%EF%BC%89%E7%9A%84%E5%80%BC.%EF%BC%8809%E5%8C%97%E4%BA%AC%E8%A5%BF%E5%9F%8E%EF%BC%892.%E5%B7%B2%E7%9F%A5%E5%B7%B2%E7%9F%A5%CE%B1%E6%98%AF%E7%AC%AC%E4%B8%80%E8%B1%A1%E9%99%90%E8%A7%92%2C%E4%B8%94cos%CE%B1%3D5%2F13%2C%E6%B1%82sin%EF%BC%88%CE%B1%2B%CF%80%2F4%EF%BC%89%2Fcos%EF%BC%882%CE%B1%2B4%CF%80%EF%BC%89%E7%9A%84%E5%80%BC.%EF%BC%8806%E4%B8%8A%E6%B5%B7%EF%BC%893.%E5%BD%93x%E2%88%88%5B-%CF%80%2F2%2C%CF%80%2F2%5D%E6%97%B6%2C%E6%B1%82%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%3D)
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