PLEASEEE HELP I WILL GIVE U BRAIN THING IF ITS CORRECT

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

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

Explain how you can find the missing fraction in 3 4/5 / (blank) 2 5/7. then find the missing fraction.