हल करना 2cos^2 alpha = 1 + cos 2alpha | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

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