A local retail store was having a sale and offered all their merchandise at a 25% discount. Write this percent as a fraction in simplest form.

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

This is different from the first one can someone me

If wxyz is a square, which statements must be true? plz < 3