document.write( "Question 755553: exact value of sin 255 \n" ); document.write( "

Algebra.Com's Answer #460033 by lwsshak3(11628) $\"\"$ $\"About$

You can put this solution on YOUR website!
exact value of sin 255
\n" ); document.write( "sin (255)=sin(135+120)=sin135 cos120+cos135 sin120
\n" ); document.write( "sin135º=√2/2*-1/2-√2/2*√3/2 =-√2/4-√6/4=-(√2+√6)/4
\n" ); document.write( "..
\n" ); document.write( "calculator check:
\n" ); document.write( "sin255º≈-0.9659..
\n" ); document.write( "exact value=-(√2+√6)/4≈-0.9659 \n" ); document.write( "

\n" );