Example

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

Question

$$\frac{1+cos\frac{\alpha}{5}-sin\frac{\alpha}{5};}{1-cos\frac{\alpha}{5}-sin\frac{\alpha}{5}}$$

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