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Trig identity 
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#1
Sep1605, 03:26 PM

P: 187

no clue how to start this:
show sin 3x = 3 sin x  4 sin^3 x 


#2
Sep1605, 03:29 PM

P: 18

How to start this: sin(3x) = sin(2x+x)



#3
Sep1605, 03:38 PM

P: 187

right so after doing this i get
sin 3x = sin2x(cos x) + (cos2x)(sin x) whats next 


#4
Sep1605, 03:52 PM

P: 18

Trig identity
sin(2x)=...?
cos(2x)=...? 


#5
Sep1605, 04:21 PM

P: 187

thanks for the help i got this and the others



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