Which representation of a which representation of a transformation on a coordinate grid does not preserve orientation?
A- (x, y) -> (y, -x)
B- (x, y) → (x, -y)
C- (x, y) -> (x – 3, y — 2)
D- (x, y)-> (1/4x, 1/4y)

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