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Cos (α - β) = cosαcosβ + sinαsinβ
Cos π/4 = 1/5 + SinαSinβ
1/2 √2 = 1/5 + SinαSinβ
SinαSinβ = 1/5 - 1/2 √2
atau langsung saja
Cos (α - β) = Cos π/4 = 1/2 √2