Example

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

Question

$$\frac { \cos \theta } { 1 - \sin \theta } + \frac { \cos \theta } { 1 + \sin \theta }$$

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