document.write( "Question 1036513: Find the exact value of cos(pi) cos(3pi/4) + sin(pi) sin (3pi/4) \n" ); document.write( "
Algebra.Com's Answer #651203 by MathTherapy(10552)\"\" \"About 
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\n" ); document.write( "Find the exact value of cos(pi) cos(3pi/4) + sin(pi) sin (3pi/4)
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This represents the COSINE Difference of 2 angles, as follows: \"cos+%28A+-+B%29+=+cos+%28A%29+cos+%28B%29+%2B+sin+%28A%29+sin+%28B%29\"
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