Given: cos (4π/9) cos(2π/9) — sin (4π/9) sin(2π/9) 1.

Last updated: 7/28/2022

Given: cos (4π/9) cos(2π/9) — sin (4π/9) sin(2π/9) 1. Identify the Trig identity that corresponds with the expression above. 2. Simplify and find the exact value. Show all work. Answers without justification will