Example

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

Question

$${ 9 }^{ 2 } = { 12 }^{ 2 } + { 6 }^{ 2 } -2(12)(6) \cos y$$

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