A liner equation determines a line in the x-y plane true or false

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

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

Select the graph of the solution. click until the correct graph appears. |x| = 3