Questions asked by Vj

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• If #a+b+c=6#, find the value of #(2-a)^3+(2-b)^3+(2-c)^3- 3(2-a)(2-b)(2-c)#?
  
• Prove that a triangle must have atleast two acute angles?
  
• If cos2A = 1-2sin^2A prove that sin15 = √2-√3/2?