TrigonometryEasySum, Difference, and Multiple-Angle Formulas ShareSum, Difference, and Multiple-Angle Formulas · Easy problemFind the exact value of cos15∘\cos 15^\circcos15∘ using 15∘=45∘−30∘15^\circ = 45^\circ-30^\circ15∘=45∘−30∘.Check Show answer Walk through it step by step Practice more like this Review this concept