Example

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

Question

$$\frac{1-\tan\ \theta}{1+\tan\ \theta}=\frac{\cot\ \theta-1}{\cot\ \theta+1}$$

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