Example

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

Question

$$\sin ^ { 2 } 60 ^ { \circ } + \cos ^ { 2 } 45 ^ { \circ } + \tan ^ { 2 } 60 ^ { \circ }$$

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