Example

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

Question

$$-2 \cos (x- \frac { \pi } { 2 } )+4 \cos ( \frac { \pi +x } { 2 } )$$

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