For the composite function fg,

To find the range of the composite function, there are 3 approaches

**Method 1**

**Method 2 (Only for strictly increasing or decreasing function)**

Since both function g and f are strictly increasing, we can deduce the range in the following manner:

**Method 3**

*Determine the range based on the rule and domain of the composite function*

Using the same f and g definition above,

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