document.write( "Question 984641: by using formula cos A = underroot 1+ 2 cos 2A upon 2 find the value of cos 30 it being given that cos 60= 1/2 \n" ); document.write( "

Algebra.Com's Answer #605419 by srinivas.g(540) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"cos+A=sqrt%28%281%2Bcos%282A%29%29%2F2%29\"$
\n" ); document.write( " put A=30
\n" ); document.write( " then
\n" ); document.write( " $\"Cos%2830%29=sqrt%28%281%2Bcos%2860%29%29%2F2%29\"$
\n" ); document.write( " $\"+cos%2830%29=sqrt%28%281%2B%281%2F2%29%29%2F2%29\"$
\n" ); document.write( " $\"cos%2830%29=+sqrt%28%283%2F2%29%2F2%29\"$
\n" ); document.write( " $\"cos%2830%29=+sqrt%283%2F4%29\"$
\n" ); document.write( " $\"cos%2830%29=sqrt%283%29%2F2\"$
\n" ); document.write( " \n" ); document.write( "

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