document.write( "Question 738676: prove identity
\n" ); document.write( "cos(2pi-x)=cosx \n" ); document.write( "

Algebra.Com's Answer #450894 by MathLover1(20850) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( " $\"cos%282pi-x%29=cos%282pi%29cos%28x%29%2Bsin%282pi%29sin%28x%29\"$ .........since $\"cos%282pi%29=1\"$ and $\"sin%282pi%29=0\"$ , we will have\r
\n" ); document.write( "\n" ); document.write( " $\"cos%282pi-x%29=1%2Acos%28x%29%2B0%2Asin%28x%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"cos%282pi-x%29=cos%28x%29\"$ \n" ); document.write( "

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