precalculus

4 - Double-Angle, Reduction, and Half-Angle Identities LEARNING OBJECTIVE: Evaluate trigonometric expressions using double- angles, reduction, and half-angle identities. Use a half-angle identity cos 1+cose 2 to find the exact value of 17TE a.) V2+13 O 2 b.) V2-V3 O 2 C.)