ches. attacks, respirator om wearing/using such products in this building. Amylab.pearson.com Outlook Homepage-23F --Technology Mathemati... Pearson MyLab and Mastering Pin-class Qu #2 K This quiz: 24 Question 2 of 10 > This questic Use a double-angle formula to find the exact value of the given expression. 2 2 cos -1 8 2* 2 cos -1= 8 (Simplify your answer. Type an exact answer, using radicals as needed. Use integers or fractions for any numbers in the expression.)