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ZedBest ResponseYou've already chosen the best response.0
http://en.wikipedia.org/wiki/List_of_trigonometric_identities
 2 years ago

ZedBest ResponseYou've already chosen the best response.0
It's located under Double, triple, and halfangle formulae
 2 years ago

malevolence19Best ResponseYou've already chosen the best response.1
\[\sin(3 \phi)=\frac{e^{3i \phi}e^{3i \phi}}{2i}\] Then use: \[e^{3i \phi}=(e^{i \phi})^3; e^{i \phi}=\cos(\phi)+i \sin(\phi)\] Then set the real part equal.
 2 years ago

virtusBest ResponseYou've already chosen the best response.0
thanks but i do not really understand the working out
 2 years ago

rivermakerBest ResponseYou've already chosen the best response.1
If you know the formula for \[\sin (A+B)\] then you can derive the formula for \[\sin 2A = \sin (A + A)\] and \[\sin 3A = \sin (A + 2A) \]
 2 years ago
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