Example

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

Question

$$\frac{\cos\ \theta}{1-\sin\ \theta}-\frac{\cos\ \theta}{1+\sin\ \theta}=2\ \tan\ \theta$$

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