document.write( "Question 979415: Write the expression as either the sine, cosine, or tangent of a single angle.
\n" ); document.write( "sin ( pi/2 ) cos (pi/7) + cos ( pi/2) sin (pi/7)
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Algebra.Com's Answer #600672 by josgarithmetic(39620)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "Follow the formula exactly as it is formed. The given expression shows everything you need. Nothing more than substitution and a little arithmetic is needed. \r
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