Thus, the range of $ f(x) $ is $[-2, 2]$.
![Thus, the range of $ f(x) $ is $[-2, 2]$.](https://soloferat.biz.id/images/thus-the-range-of--fx--is--2-2.jpg)
![Thus, the range of $ f(x) $ is $[-2, 2]$.](https://soloferat.biz.id/images/thus-the-range-of--fx--is--2-2.jpg)
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