Posted by Stephan pultree on Sunday, April 29, 2012 at 2:06am.
Use compound angle formulae to express Second harmonic i2= sin2t and the the third harmonic i3=sin3t in terms of the first harmonic sint

Maths trig  Steve, Sunday, April 29, 2012 at 10:50am
sin2t = 2 sint cost
sin3t = sint cos2t + cost sin2t
(cos2t = 1  2sin^2 t) 
Maths trig  Stephan pultree, Sunday, April 29, 2012 at 12:27pm
Thanks :)

Maths trig  Stephan pultree, Sunday, April 29, 2012 at 12:29pm
Whats the workings out to get to these answers ? Jw ta