Example

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

Question

$$3 \lim _ { x \rightarrow 0 } \frac { \tan ^ { 2 } 3 x } { \sin ^ { 2 } x }$$

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