document.write( "Question 1131543: Find all the solutions in the interval [0, 2𝜋)\r
\n" ); document.write( "\n" ); document.write( "cos^2(x)+2cos(x)+1=0\r
\n" ); document.write( "\n" ); document.write( "Thank you! \n" ); document.write( "

Algebra.Com's Answer #748212 by MathLover1(20850) $\"\"$ $\"About$

You can put this solution on YOUR website!

\n" ); document.write( " $\"cos%5E2%28x%29%2B2cos%28x%29%2B1=0\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"%28cos%28x%29%2B1%29%5E2=0\"$ \r
\n" ); document.write( "\n" ); document.write( "solution:\r
\n" ); document.write( "\n" ); document.write( " $\"cos%28x%29%2B1=0\"$ => $\"cos%28x%29=-1\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=pi\"$ or $\"x=180\"$ ° \n" ); document.write( "

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