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Question Number 175650 by mnjuly1970 last updated on 04/Sep/22

$$$$$$$$$$cos\left(5x\right)=a.{cos}^5\left(x\right)+b.{cos}^4\left(x\right)+c.{cos}^3\left(x\right)+d.{cos}^2\left(x\right)+e.cos\left(x\right)+f$$$$a,b,c,d,e,f=?$$$$$$$$$$

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