![]() √2 2 2 2 The result can be shown in multiple forms. Hence: b = a × cos(γ) + c × cos(α) and by multiplying it by b, we get: b² = ab × cos(γ) + bc × cos(α) (1) Analogical equations may be derived for other two sides: a² = ac × cos(β) + ab × cos(γ) (2) c² = bc × cos(α) + ac × cos(β) (3) The exact value of cos(45) cos ( 45) is √2 2 2 2.
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