PrecalculusEasyAnalytic Trigonometry ShareAnalytic Trigonometry · Easy problemUse a sum formula with 105∘=60∘+45∘105^\circ=60^\circ+45^\circ105∘=60∘+45∘ to find the exact value of cos105∘\cos105^\circcos105∘.Check Show answer Walk through it step by step Practice more like this Review this concept