Express the following as a product :
$cos 2 x - cos 4 x$

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Express the following as a product :

cos 2 x - cos 4 x

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Text solutionVerified

Using the formula,

cos C - cos D = 2 sin \frac{C + D}{2} sin \frac{D - C}{2}

cos 2 x - cos 4 x

= 2 sin (\frac{2 x + 4 x}{2}) sin (\frac{4 x - 2 x}{2})

= 2 sin 3 x sin x

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Question Text	Express the following as a product : $cos 2 x - cos 4 x$
Answer Type	Text solution:1
Upvotes	150