Example

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

Question

$$\sin\ 45^{\circ}-eos\ 65^{\circ}+\sin\ 135^{\circ}\cos\ 115^{\circ}a$$

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