### Proof of A cos x + B sin x = R cos (x - alpha) : ExamSolutions

In this tutorial you are shown how to prove the above trig. identity. To see the full revision guide on this and other similar identities goto ExamSolutions at http://www.examsolutions.co.uk/maths-tutorials/Core-maths/trigonometry/Identities/Rsin-cos-proofs/revision-guide.php

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