CBSE Class 11 science: Sum and Difference Formulae Videos | Deriving addition, subtraction formulae of trigonometric angles

• Sin(x)/√2+cos(x)/√2=√3/2
• Please solve 41 st question
  
• if tan(pie/4+teta)+tan(pie/4-teta)=3
  
• A+B=360° tanA+tanB/1-tanA tanB
  
• pls clear the doubt, dear sir/ madam
  
• If A+B+C=π then prove that  Cos^A+Cos^B+Cos^C=1-2CosA.CosB.CosC
• .
  
• plzz explain how to solve it with the solution
  
• Pls answer the attached questions ASAP
  
• Pls solve it.
  

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