20-05-2016
Mathematics

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Cos3x+cosx=2cos2xcosx

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GreenEyes71 GreenEyes71

21-05-2016

[tex]cos(3x)+cos(x)=2\cdot cos\left(\dfrac{3x+x}{2}\right)\cdot cos\left(\dfrac{3x-x}{2}\right)=2\cdot cos(2x)\cdot cos(x).[/tex]

Green eyes.

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