Example

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

Question

$$\sin [ \frac { \pi } { 2 } - \sin ^ { - 1 } ( - \frac { \sqrt { 3 } } { 2 } ) ]$$

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