Example

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

Question

$$\displaystyle\int_{ 0 }^{ \frac{ \pi }{ 2 } } { \sin }^{ 2 } x { \cos }^{ 2 } x d x$$

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