Question 1012405
<pre>
{{{sin(3x)+sin(x)}}}{{{""=""}}}{{{cos(x)}}}

{{{sin(2x+x)+sin(2x-x)}}}{{{""=""}}}{{{cos(x)}}}

{{{sin(2x)cos(x)+cos(2x)sin(x)+sin(2x)cos(x)-cos(2x)sin(x)}}}{{{""=""}}}{{{cos(x)}}}

{{{sin(2x)cos(x)+cross(cos(2x)sin(x))+sin(2x)cos(x)-cross(cos(2x)sin(x))}}}{{{""=""}}}{{{cos(x)}}}

{{{2sin(2x)cos(x)}}}{{{""=""}}}{{{cos(x)}}}

{{{2sin(2x)cos(x)-cos(x)}}}{{{""=""}}}{{{0}}}

{{{cos(x)(2sin(2x)^""-1)}}}{{{""=""}}}{{{0}}}

{{{cos(x)}}}{{{""=""}}}{{{0}}}; {{{2sin(2x)^""-1}}){{{""=""}}}{{{0}}}

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{{{cos(x)}}}{{{""=""}}}{{{0}}}
{{{x}}}{{{""=""}}}{{{matrix(1,3,pi/2,",",3pi/2)}}} <-- two solutions

{{{2sin(2x)-1}}}{{{""=""}}}{{{0}}}

{{{2sin(2x)}}}{{{""=""}}}{{{1}}}

{{{sin(2x)}}}{{{""=""}}}{{{1/2}}}

{{{2x}}}{{{""=""}}}{{{matrix(1,7,pi/6,",",5pi/6,",",13pi/6,",",17pi/6)}}}

{{{x}}}{{{""=""}}}{{{matrix(1,7,pi/12,",",5pi/12,",",13pi/12,",",17pi/12)}}}  <-- four more solutions

Edwin</pre>