Find the exact value of cos (2a) 193 viewsOctober 30, 2017trigonometry 0 admin54 Posted October 27, 2017 admin deleted answer October 30, 2017 Find the exact value of 1 Answer ActiveVotedNewestOldest 0 admin54 Posted October 30, 2017 Use the third formula for the double-angle Attachments 8A180B2C-7902-4536-AC71-1FE13ED23368.jpeg Register or Login