已知角a的顶点在原点,始边与x轴的正半轴重合,终边经过点P(-3,根号3)1.sin2a-tana的值2.若函数f(x)=cos(x-a)cosa-sin(x-a)sina,求函数y=根号3f(π/2-2x)-2f²(x)在区间【0,2π/3】上的取值范围
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![已知角a的顶点在原点,始边与x轴的正半轴重合,终边经过点P(-3,根号3)1.sin2a-tana的值2.若函数f(x)=cos(x-a)cosa-sin(x-a)sina,求函数y=根号3f(π/2-2x)-2f²(x)在区间【0,2π/3】上的取值范围](/uploads/image/z/2499836-68-6.jpg?t=%E5%B7%B2%E7%9F%A5%E8%A7%92a%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9C%A8%E5%8E%9F%E7%82%B9%2C%E5%A7%8B%E8%BE%B9%E4%B8%8Ex%E8%BD%B4%E7%9A%84%E6%AD%A3%E5%8D%8A%E8%BD%B4%E9%87%8D%E5%90%88%2C%E7%BB%88%E8%BE%B9%E7%BB%8F%E8%BF%87%E7%82%B9P%28-3%2C%E6%A0%B9%E5%8F%B73%291.sin2a-tana%E7%9A%84%E5%80%BC2.%E8%8B%A5%E5%87%BD%E6%95%B0f%28x%29%3Dcos%28x-a%29cosa-sin%28x-a%29sina%2C%E6%B1%82%E5%87%BD%E6%95%B0y%3D%E6%A0%B9%E5%8F%B73f%28%CF%80%2F2-2x%29-2f%26%23178%3B%28x%29%E5%9C%A8%E5%8C%BA%E9%97%B4%E3%80%900%2C2%CF%80%2F3%E3%80%91%E4%B8%8A%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4)
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