document.write( "Question 1064902: Please help me find Cos(A-b) in the following equation. \r
\n" ); document.write( "\n" ); document.write( "Equation: https://s28.postimg.org/fbpu1fv25/tan_a_5.png\r
\n" ); document.write( "\n" ); document.write( "Thank you. \n" ); document.write( "

Algebra.Com's Answer #680052 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"tan%28A%29=5=5%2F1=sin%28A%29%2Fcos%28A%29\"$
\n" ); document.write( "so,
\n" ); document.write( " $\"sin%28A%29=-5%2Fsqrt%285%5E2%2B1%5E2%29=-5%2Fsqrt%2826%29=-%285%2F26%29sqrt%2826%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"cos%28A%29=-1%2Fsqrt%2826%29=-sqrt%2826%29%2F26\"$
\n" ); document.write( "and
\n" ); document.write( " $\"sin%28B%29=2%2F3\"$
\n" ); document.write( " $\"cos%28B%29=-sqrt%281-%282%2F3%29%5E2%29=-sqrt%281-4%2F9%29=-sqrt%285%2F9%29=-sqrt%285%29%2F3\"$
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( "Now use the formula,
\n" ); document.write( " $\"cos%28A-B%29=cos%28A%29cos%28B%29%2Bsin%28A%29sin%28B%29\"$ \r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );