Question 1148987
<br>
{{{sin(A) = sin(2A)}}}<br>
There is only one thing you can do to that to get started: use the identity for sin(2A).<br>
{{{sin(A) = 2sin(A)cos(A)}}}<br>
Then it's basic algebraic techniques from there: get 0 on one side and factor.<br>
{{{sin(A)-2sin(A)cos(A) = 0}}}
{{{sin(A)(1-2cos(A)) = 0}}}<br>
{{{sin(A) = 0}}} or {{{1-2cos(A) = 0}}}<br>
I'll let you finish from there.<br>