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The question says it all, why? Also, those are not powers, all of them are co-efficient, thanks.

PS This is actually not a homework, was a solved example I was going through and I got confused.

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  • $\begingroup$ What have you tried? If you tell us this then we will be better able to help you. And it helps us feel that we are not just doing your homework for you. $\endgroup$
    – user1729
    Sep 1, 2014 at 11:42
  • $\begingroup$ This is actually not a homework, was a solved example I was going through and I got confused. $\endgroup$ Sep 1, 2014 at 12:33
  • $\begingroup$ @AkshatTripathi Is is still confusing with the answer below? $\endgroup$ Sep 1, 2014 at 14:01
  • $\begingroup$ @Jean-ClaudeArbaut Nono, solved, thanks for asking. :) $\endgroup$ Sep 1, 2014 at 14:32

1 Answer 1

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It is a simple formula which says

$\sin(2x) = 2\sin(x)\cos(x)$

In your question this formula is applied twice

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