document.write( "Question 979489: 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) \r \n" );
document.write( "\n" );
document.write( "Here is my work, can you please double check?\r \n" );
document.write( "\n" );
document.write( "sin ( a + b) = sin ( a ) cos (b) + cos (a) sin (b) \n" );
document.write( "sin (pi/2 + pi/7)= sin ( pi/2 ) cos (pi/7) + cos ( pi/2) sin (pi/7) \r \n" );
document.write( "\n" );
document.write( "sin ( 9 pi/14) \n" );
document.write( "
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