Leaving Certificate Proof of Cos(A-B) Formula.

Watch breakthrough maths tutor Niamh take you through a step-by-step proof of the Cos(A-B) = Cos(A)Cos(B) +Sin(A)Sin(B) formula.

Trigonometric proofs consistently appear on Leaving Certificate Mathematics exams.

Watch and learn how to answer a Trigonometric Proof question here!

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