Angle Sum And Difference Trigonometric Identities (Sine and Cosine) Worksheet (With Solutions)

A worksheet on the angle sum and difference trigonometric identities for sine and cosine (sin(a+b), sin(a-b), cos(a+b) and cos (a-b). The exercises require to use the identities to find the value of given expressions and to prove other trigonometric identities. Detailed solutions are included.