Sum difference and product of two functions

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

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

The total number of dental clinics total for the last 12 months was recorded