document.write( "Question 1055345: cos^2x+2cosx+1=0 \n" ); document.write( "

Algebra.Com's Answer #670572 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
cos^2x+2cosx+1=0
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\n" ); document.write( "Factor::
\n" ); document.write( "(cos(x)+1)^2 = 0
\n" ); document.write( "cos(x) = -1
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\n" ); document.write( "x = pi rad or 180 degrees
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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