Example

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

Question

$$\frac { 2 } { \pi } \int _ { 0 } ^ { \pi } x \sin ( x ) d x$$

Evaluate

$2$

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