函数f(x)=(1+cos2x)/4sin(π/2+x)-asin(x/2)*cos(π-x/2)的最大值为2,试确定常数a的值.(π就是派)(cosx+asinx)/2 =根号(1+a^2)·cost/2 能不能再解释下``````
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![函数f(x)=(1+cos2x)/4sin(π/2+x)-asin(x/2)*cos(π-x/2)的最大值为2,试确定常数a的值.(π就是派)(cosx+asinx)/2 =根号(1+a^2)·cost/2 能不能再解释下``````](/uploads/image/z/1042145-17-5.jpg?t=%E5%87%BD%E6%95%B0f%28x%29%3D%281%2Bcos2x%29%2F4sin%28%CF%80%2F2%2Bx%29-asin%28x%2F2%29%2Acos%28%CF%80-x%2F2%29%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%BA2%2C%E8%AF%95%E7%A1%AE%E5%AE%9A%E5%B8%B8%E6%95%B0a%E7%9A%84%E5%80%BC.%EF%BC%88%CF%80%E5%B0%B1%E6%98%AF%E6%B4%BE%EF%BC%89%28cosx%2Basinx%29%2F2+%3D%E6%A0%B9%E5%8F%B7%EF%BC%881%2Ba%5E2%EF%BC%89%C2%B7cost%2F2+%E8%83%BD%E4%B8%8D%E8%83%BD%E5%86%8D%E8%A7%A3%E9%87%8A%E4%B8%8B%60%60%60%60%60%60)
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