Questions asked by Anish Rai

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• #a+b+c=180^@#, #cos(b+c-a)+cos(c+a-b)+cos(a+b-c) =1+4cos(a)cos(b)cos(c)#?? As plz
  
• #1-2sina*cosa÷2=sin^2(45^@-a)#?
  
• 16sin20.sin40.sin60.sin80=3 Prove.?
  
• #tan theta + 2tan2theta + 4cot4theta = cot theta # How to prove?
  
• Prove that #Cos^6(x)+sin^6(x)=1/8(5+3cos4x)#?
  
• Prove #Cos^2A+Sin^2A*cos2B=cos^2B+sin^2B*cos2A#?
  
• 4cosa.cos(60-a).cos(60+a)=cos3a ?
  
• Sin^4x=1/8(3-4cos2x+cos4x) How to prove?
  
• If the point(x,14)divides the line joining the points (7,11) and (-18,16),find the value of x?