Example

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

Question

$$\frac{\sin\ A}{1-\cos\ A}+\frac{1-\cos\ A}{\sin\ A}=2co\sec\ A$$

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