document.write( "Question 305188: how do i find the exact value of cos 810 degrees? \n" ); document.write( "
Algebra.Com's Answer #218504 by Alan3354(69443)\"\" \"About 
You can put this solution on YOUR website!
Subtract 360º repeatedly until the angle is less than 360
\n" ); document.write( "810 - 360 = 450
\n" ); document.write( "450 - 360 = 90
\n" ); document.write( "cos(90) = 0
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