Example

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

Question

$$2\ \cos^{2}\alpha=1+\cos\ 2\ \alpha$$

Solve for α

$\alpha \in \mathrm{R}$

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