1 当x属于(0,2],函数f(x)=ax^2+4(a+1)x-3在x=2时取得最大值,则a的取值范围是?2 求y=(2sinx-1)/(1+cosx)的值域3 已知点P(x,y)在圆x^2+y^2=1上,求y/(x+2)及y-2x的取值范围a大于等于-1/22 (负无穷,3/2]3 [-根号3/3,根
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![1 当x属于(0,2],函数f(x)=ax^2+4(a+1)x-3在x=2时取得最大值,则a的取值范围是?2 求y=(2sinx-1)/(1+cosx)的值域3 已知点P(x,y)在圆x^2+y^2=1上,求y/(x+2)及y-2x的取值范围a大于等于-1/22 (负无穷,3/2]3 [-根号3/3,根](/uploads/image/z/11697042-66-2.jpg?t=1+%E5%BD%93x%E5%B1%9E%E4%BA%8E%EF%BC%880%2C2%5D%2C%E5%87%BD%E6%95%B0f%28x%29%3Dax%5E2%2B4%28a%2B1%29x-3%E5%9C%A8x%3D2%E6%97%B6%E5%8F%96%E5%BE%97%E6%9C%80%E5%A4%A7%E5%80%BC%2C%E5%88%99a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%3F2+%E6%B1%82y%3D%282sinx-1%29%2F%281%2Bcosx%29%E7%9A%84%E5%80%BC%E5%9F%9F3+%E5%B7%B2%E7%9F%A5%E7%82%B9P%EF%BC%88x%2Cy%29%E5%9C%A8%E5%9C%86x%5E2%2By%5E2%3D1%E4%B8%8A%2C%E6%B1%82y%2F%28x%2B2%29%E5%8F%8Ay-2x%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4a%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E-1%2F22+%EF%BC%88%E8%B4%9F%E6%97%A0%E7%A9%B7%2C3%2F2%5D3+%5B-%E6%A0%B9%E5%8F%B73%2F3%2C%E6%A0%B9)
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