document.write( "Question 743919: FIND ALL DEGREE SOLUTIONS:\r
\n" ); document.write( "\n" ); document.write( "sin x + cos (2x)= 0 \n" ); document.write( "

Algebra.Com's Answer #453213 by lwsshak3(11628) $\"\"$ $\"About$

You can put this solution on YOUR website!
sin x + cos (2x)= 0
\n" ); document.write( " $\"sin%28x%29%2Bcos%282x%29=0\"$
\n" ); document.write( " $\"sin%28x%29%2Bcos%5E2%28x%29-sin%5E2%28x%29=0\"$
\n" ); document.write( " $\"sin%28x%29%2B1-sin%5E2%28x%29-sin%5E2%28x%29=0\"$
\n" ); document.write( " $\"sin%28x%29%2B1-2sin%5E2%28x%29=0\"$
\n" ); document.write( " $\"2sin%5E2%28x%29-sinx-1=0\"$
\n" ); document.write( "(2sin(x)+1)(sin(x)-1)=0
\n" ); document.write( "2sin(x)+1=0
\n" ); document.write( "sin(x)=-1/2
\n" ); document.write( "x=210º+360n, 330º+360n,n=integer (Q3 and Q4 where sin<0)
\n" ); document.write( "or
\n" ); document.write( "sin(x)-1=0
\n" ); document.write( "sin(x)=1
\n" ); document.write( "x=90º+360n, n=integer \n" ); document.write( "

\n" );