Question: 13 Use double-angle formulae to show that: a 2sin % cos = sin & 2 b cos 4n 7 . 2 Sin 3z _ 7

13 Use double-angle formulae to show that: a 2sin % cos

13 Use double-angle formulae to show that: a 2sin % cos = sin & 2 b cos 4n 7 . 2 Sin 3z _ 7 =

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