Trigonometric results

Hai friends, do you facing any problem in trigonomery? Here is some important results for you,just go through it.

Addition formulae

• sin(A+B) = sinAcosB+cosAsinB
• cos(A+B) = cosAcosB-sinAsinB
• tan(A+B) = tanA+tanB /(1-tanAtanB)
  

Subtractin formulae

• sin(A-B) = sinAcosB-cosAsinB
• cos(A-B) = cosAcosB+sinAsinB
• tan(A-B) = tanA-tanB /(1+tanAtanB)

Sum and difference formulae

• 2SinACosB =Sin(A+B)+Sin(A-B)
• 2CosACosB=Cos(A+B)+Cos(A-B)
• 2CosASinB =Sin(A+B)-Sin(A-B)
• 2SinASinB =Cos(A-B)-Cos(A+B)

Product formulae

• SinC+SinD =2Sin(C+D)/2*Cos(C-D)/2
• SinC-SinD =2Cos(C+D)/2*Sin(C-D)/2
• CosC+CosD=2Cos(C+D)/2*Cos(C-D)/2
• CosC-CosD=2Sin(C+D)/2*Sin(C-D)/2

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