Answers edited by Rajat Chatterjee

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• How do you integrate #x * cos^2 (x)#?
  
• How is shielding effect explained?
  
• How do you long divide #(x^3+3x^2+3x+1)/(x+1)#?
  
• Question #b8b69
  
• How do you use demoivre's theorem to simplify #[2(cos((pi)/2)+isin((pi)/2))]^8#?