Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$f ( x ) = \frac { \sqrt { 4 - x ^ { 2 } } } { \sqrt { x ^ { 2 } - 9 } }$$

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