document.write( "Question 1104953: How to find sin120
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Algebra.Com's Answer #719684 by Boreal(15235) $\"\"$ $\"About$

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sin 120=sin (90+30)
\n" ); document.write( "sin (a+b)=sin a* cos b+cos a*sin b
\n" ); document.write( "This is sin 90*cos 30+ cos 90*sin 30; cos 90=0, so second term is 0.
\n" ); document.write( "sin 90 is 1, so sin 120=cos 30=sqrt(3)/2 \n" ); document.write( "

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