Example

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

Question

$$\frac{1}{\sin\ A}-\frac{1}{cosA}=-\frac{1}{\sin\ B}-\frac{1}{cosB}$$

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