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The doubleangleformulae
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The double angle formulae - Mathematics resources
www.mathcentre.ac.ukThe double angle formulae mc-TY-doubleangle-2009-1 This unit looks at trigonometric formulae known as the doubleangleformulae. They are called this because they involve trigonometric functions of double angles, i.e. sin2A, cos2A and tan2A.