Example

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

Question

$$\frac { 1 } { \tan A } - \frac { 1 } { \tan 2 A } = \frac { 1 } { \sin 2 A }$$

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