Answers edited by dhilak

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• 1) If θ is a fixed real number with 0≤θ<2π Show that for all real x, cos(x)+cos(x+θ)=Acos(x+φ) where φ=θ/2 and A=2cos(θ/2) 2) Determine θ if A=1/4 and if A=-1?
  
• How to integrate this? #intcolor(white).(3x^2-x+1)/(x^3-x^2)#