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The Addition Formulae

There are six so-called addition formulae often needed in the solution of trigonometric problems. In this unit we start with one and derive a second from that. Then we take another one as given and derive a second one from that. Finally we use these four to help us derive the final two. This exercise will improve your familiarity and confidence in working with the addition formulae. The proofs of the formulae are left as structured exercises for you to complete.

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