Need someone to talk to add me on snap or insta at kynghavoc​

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

Pls will give brainliest and all p.s u can zoom in if u cant see plss

Find the value of x. round the length to the nearest tenth