Which sign makes the statement true? i don’t wanna get this question wrong bc i’m at 88

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

Polynomial that can be factored as (3x-4)(3x+4)

How do you determine if an ordered pair is a solution to a given equation?