document.write( "Question 1026324: If sin a equal 2/3 and cos b equal 2/5 what is cos a+b \n" ); document.write( "
Algebra.Com's Answer #641568 by Cromlix(4381)\"\" \"About 
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Hi there,
\n" ); document.write( "If sin a = 2/3
\n" ); document.write( "cos a = √5/3
\n" ); document.write( "If cos b = 2/5
\n" ); document.write( "sin b = √21/5
\n" ); document.write( "...........
\n" ); document.write( "cos(a + b) expands to:
\n" ); document.write( "cosacosb - sinasinb
\n" ); document.write( "√5/3 2/5 - 2/3 √21/5
\n" ); document.write( "2√5/15 - 2√21/15
\n" ); document.write( "2(√5 - √21)/15
\n" ); document.write( "Hope this helps :-) \n" ); document.write( "
\n" );