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Rzqust [24]
3 years ago
9

Cos3x+cosx=2cos2xcosx

Mathematics
1 answer:
andrew-mc [135]3 years ago
8 0

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).

Green eyes.

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