Let alpha = 4sin^2 10^@ + 4 sin^2 50^@ c...

Let `alpha = 4sin^2 10^@ + 4 sin^2 50^@ cos 20^@ + cos 80^@` and `beta= cos^2 ((pi)/5) + cos^2 ((2pi)/5) + cos^2 ((8pi)/15)`. Find `(alpha+beta)`.

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