Practice problem
Simplify the expression cos2(28∘)−sin2(28∘)\\\cos^2(28^{\circ})-\sin^2(28^{\circ})cos2(28∘)−sin2(28∘)
tan(56∘)\tan(56^{\circ})tan(56∘)
sin(56∘)\sin(56^{\circ})sin(56∘)
cos(56∘)\cos(56^{\circ})cos(56∘)
cos(28∘)\cos(28^{\circ})cos(28∘)
Type a concept, like “slope” or “photosynthesis”.