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【简答题】
设函数 f(x)=-co s 2 x-4t?sin x 2 cos x 2 +2 t 2 -6t+2(x∈R) （1）当t=1时，求f（x）的最小值； （2）若t∈R，将f（x）的最小值记为g（t），求g（t）的表达式； （3）当-1≤t≤1时，关于t的方程g（t）=kt有且只有一个，求实数k的取值范围．
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