已知函数f(x)=sin^2x+asinx+a^2+b-1/a (1)设a>0,b=5/3,求证 f(x)>=9/4已知函数f(x)=sin^2x+asinx+a^2+b-1/a (1)设a>0,b=5/3,求证 f(x)>=9/4;(2)若b=-2,f(x)的最大值大于6,求实数a的取值范围;(3)设a>=2,若存在x∈ 使得f(x
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