Example

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

Question

$$\frac{ \sin 2 \theta }{ \sin \theta } - \frac{ \cos 2 \theta }{ \cos \theta } \sec \theta$$

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