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If $\cos α + \cos β = \sin α + \sin β$ ,then $\cos 2 α + \cos 2 β =$

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Correct option is B

cosα+cosβ=sinα+sinβon Squaring, cos2α+cos2β+2cosαcosβ= sin2α+sin2β+2sinαsinβ⇒cos2α-sin2α+cos2β-sin2β=-2cosαcosβ-sinαsinβ⇒cos2α+cos2β=-2cosα+β

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If cosα+cosβ=sinα+sinβ,then cos2α+cos2β=

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Ready to Test Your Skills?

free study material

If $\cos α + \cos β = \sin α + \sin β$ ,then $\cos 2 α + \cos 2 β =$