Example

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

Question

$$\tan^{2}60^{\circ}+2\ \cos^{2}45^{\circ}+3\sec^{2}30^{\circ}$$

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