document.write( "Question 1071448: write the expression as sine, cosine or tangent of a single angle.
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Algebra.Com's Answer #686405 by ikleyn(52803) $\"\"$ $\"About$

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\n" ); document.write( "write the expression as sine, cosine or tangent of a single angle.
\n" ); document.write( "cos(pi )/(6)cos(pi )/(7)-sin(pi )/(6)sin(pi )/(7)
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document.write( "Apply the formula of sum for cosine:\r\n" );
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document.write( "cos(a)*cos(b) - sin(a)*sin(b) = cos(a+b).\r\n" );
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document.write( "    See the lesson   Addition and subtraction formulas  in this site.\r\n" );
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document.write( "You will get \r\n" );
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document.write( " =  =  = .\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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