document.write( "Question 665901: cos(pi/10) = cos (-pi/10) How do i show this to be true. Explain \n" ); document.write( "
Algebra.Com's Answer #414164 by Alan3354(69443)\"\" \"About 
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cos(pi/10) = cos (-pi/10) How do i show this to be true. Explain
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\n" ); document.write( "Use the unit circle, or plot the terminal points on the x-y plane.
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