document.write( "Question 1138451: Write the expression as the sine or cosine of an angle.
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Algebra.Com's Answer #756261 by ikleyn(52816) $\"\"$ $\"About$

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document.write( "sin (pi/2) = 1;   cos (pi/2) = 0.  Therefore,\r\n" );
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document.write( "sin ( pi/2 ) cos (pi/7) + cos ( pi/2) sin (pi/7) = 1*cos(pi/7) + 0*sin(pi/7) = cos(pi/7).\r\n" );
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