函数f(x)=(a-1)x^2+2ax+3,x属于(-1,1)是偶函数,指出它的单调区间
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![函数f(x)=(a-1)x^2+2ax+3,x属于(-1,1)是偶函数,指出它的单调区间](/uploads/image/z/5925013-61-3.jpg?t=%E5%87%BD%E6%95%B0f%28x%29%3D%28a-1%29x%5E2%2B2ax%2B3%2Cx%E5%B1%9E%E4%BA%8E%EF%BC%88-1%2C1%EF%BC%89%E6%98%AF%E5%81%B6%E5%87%BD%E6%95%B0%2C%E6%8C%87%E5%87%BA%E5%AE%83%E7%9A%84%E5%8D%95%E8%B0%83%E5%8C%BA%E9%97%B4)
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