SOLUTION: He all, can you please help me verifying this identity step by step?: sin(3α)=3sin(α)-4sin^3(α) Thank you very much in advance RB

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Question 1031286: He all,
can you please help me verifying this identity step by step?:
sin(3α)=3sin(α)-4sin^3(α)
Thank you very much in advance
RB
Answer by ikleyn(52814)   (Show Source): You can put this solution on YOUR website!
.
He all,
can you please help me verifying this identity step by step?:
sin(3α)=3sin(α)-4sin^3(α)
Thank you very much in advance
RB
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 

Do you know this formula:   =  ?

Apply it one time, and you will get

 = ,

 =  =  = .

Apply it one more time, and you will get

 =  = 
                  
          =  = 

          =  = 

          =  = 

          = .


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