document.write( "Question 34006: using sum, difference, half, or double angle formulas and the exact value chart in the solution, find the exact value of cos 105 degrees. \n" ); document.write( "

Algebra.Com's Answer #21619 by venugopalramana(3286) $\"\"$ $\"About$

You can put this solution on YOUR website!
COS(105)=COS(60+45)=COS 60 * COS 45 - SIN 60 * SIN 45
\n" ); document.write( "=(1/2)*(1/SQRT2)-(SQRT3/2)*(1/SQRT2)
\n" ); document.write( "=(1-SQRT3)/2SQRT2=-0.25882 \n" ); document.write( "

\n" );