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Cos3x+cosx=2cos2xcosx
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Cos3x+cosx=2cos2xcosx

User Yuit
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cos(3x)+cos(x)=2\cdot cos\left((3x+x)/(2)\right)\cdot cos\left((3x-x)/(2)\right)=2\cdot cos(2x)\cdot cos(x).

Green eyes.

User Siegfried Gevatter
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