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Prove that Cos4x=8Cosx -8Cosx​

Prove that Cos4x=8Cosx -8Cosx​
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Prove that Cos4x=8Cosx -8Cosx​

User Lawrence Tierney
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Please see the image attached
Prove that Cos4x=8Cosx -8Cosx​-example-1
User Sabari
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