PLEASE HELP Write each radical using rational exponents, and simplify.

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

If you could answer these your a life saver

Determine which postulate or theorem can be used to prove that lmn =nmo