magalyrodette9058 magalyrodette9058

02-03-2018
Mathematics

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Write the expression in terms of sine only sin 9x cos 9x

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nikita83 nikita83

02-03-2018

[tex]\sin 2\alpha= 2\sin \alpha\cos\alpha\quad\Rightarrow\quad\sin 9x\cos 9x=\frac{1}{2}\sin 18x[/tex]

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