Sum and Difference Identities (Summary)

Question 1

Sin (A + B) = ?

Answer 1

Sin A Cos B + Cos A Sin B

Question 2

Sin (A - B) = ?

Answer 2

Sin A Cos B - Cos A Sin B

Question 3

Cos (A + B) = ?

Answer 3

Cos A Cos B - Sin A Sin B

Question 4

Cos (A - B) = ?

Answer 4

Cos A Cos B + Sin A Sin B

Question 5

Tan (A + B) = ?

Answer 5

Tan A + Tan B / 1 - Tan A * Tan B

Question 6

Tan (A - B) = ?

Answer 6

Tan A - Tan B / 1 + Tan A * Tan B