document.write( "Question 969011: Using a Double-Angle Formula we see that the equation sin x + sin 2x = 0 is equivalent to the equation__________, Factoring we see that solving this equation is equivalent to solving the two basic equations sin x = 0 and_____. \n" ); document.write( "

Algebra.Com's Answer #592038 by lwsshak3(11628) $\"\"$ $\"About$

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for interval [0, π]
\n" ); document.write( "sin x + sin 2x = 0
\n" ); document.write( "sinx+2sinxcosx=0
\n" ); document.write( "sinx(1+2cosx)=0
\n" ); document.write( "sinx=0
\n" ); document.write( "x=0
\n" ); document.write( "or
\n" ); document.write( "1+2cosx=0
\n" ); document.write( "2 cosx=-1
\n" ); document.write( "cosx=-1/2
\n" ); document.write( "x=2π/3 \n" ); document.write( "

\n" );