What is 912 divided by 872784

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

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.