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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

Which is the completely factored from of xy^3-x^3y

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm