Gaokao Math Practice Question
已知函数 $f(x)=x^{2}-2 x+a\left(e^{x-1}+e^{-x+1}\right)$ 有唯一零点, 则 $a=(\qquad)$
- A.$-\frac{1}{2}$
- B.$\frac{1}{3}$
- C.$\frac{1}{2}$
- D.1
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