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Trig identity

by thenewbosco
Tags: identity, trig
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thenewbosco
#1
Sep16-05, 03:26 PM
P: 187
no clue how to start this:

show

sin 3x = 3 sin x - 4 sin^3 x
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Dr Avalanchez
#2
Sep16-05, 03:29 PM
P: 18
How to start this: sin(3x) = sin(2x+x)
thenewbosco
#3
Sep16-05, 03:38 PM
P: 187
right so after doing this i get

sin 3x = sin2x(cos x) + (cos2x)(sin x)

whats next

Dr Avalanchez
#4
Sep16-05, 03:52 PM
P: 18
Trig identity

sin(2x)=...?
cos(2x)=...?
thenewbosco
#5
Sep16-05, 04:21 PM
P: 187
thanks for the help i got this and the others


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