The document lists various trigonometric identities involving addition, subtraction, and multiplication of trigonometric functions like sine, cosine, and tangent. Some key identities include: (i) sin(x+y)=sinxcosy+cosxsiny, (ii) cos(x+y)=cosxcosy-sinxsiny, and (iii) tan(x+y)=tanxtany/(1-tanxtany).