Example

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

Question

$$\displaystyle\int_{ -1 }^{ 1 } (1- \frac{ \cos 2 \theta x }{ 2 \theta } ) d x$$

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