Example

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

Question

$$\lim _ { x \rightarrow 0 } \frac { 1 } { x } ( \cot 2 x - \frac { 1 } { \sin 2 x } )$$

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