Given f(x) = 2 cos r, find the exact value of f () in simplest form with a
rational denominator.

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

W-16=-12 solve each one step equation plz

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64