Example

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

Question

$$x ^ { 2 } + y ^ { 2 } - x y \tan 2 x ^ { 2 } - 2 y ^ { 2 } + 4 y$$

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