5.3 (Sum & Difference Formulas)

Question 1

What is the cosine sum and difference formula?

Answer 1

cos(α +/- β)=cosαcosβ -/+ sinαsinβ

Question 2

What is the sine sum and difference formula?

Answer 2

sin(α +/- β)=sinαcosβ +/- cosαsinβ

Question 3

What is the tangent sum and difference formula?

Answer 3

tan(α +/- β)=(tanα +/- tanβ)/(1 -/+ tanαtanβ)