document.write( "Question 1072042: Find solutions in the internal (0,2π)
\n" ); document.write( "Cos^2x+2cosx+1= 0\r
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Algebra.Com's Answer #687025 by ikleyn(52879) $\"\"$ $\"About$

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\n" ); document.write( "Find solutions in the internal (0,2π)
\n" ); document.write( "Cos^2x+2cosx+1= 0
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document.write( " = 0  ====>   = 0  ====>  cos(x) + 1 = 0  ====>  \r\n" );
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document.write( "cos(x) = -1  ====>  x = .\r\n" );
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document.write( "Answer. There is only one solution in the given interval:  x = .\r\n" );
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\n" ); document.write( "\n" ); document.write( "To see more examples of solved trigonometry equations with detailed solutions, look into the lessons \r
\n" ); document.write( "\n" ); document.write( "    - Solving simple problems on trigonometric equations\r
\n" ); document.write( "\n" ); document.write( "    - Solving typical problems on trigonometric equations\r
\n" ); document.write( "\n" ); document.write( "    - Solving more complicated problems on trigonometric equations\r
\n" ); document.write( "\n" ); document.write( "    - Solving advanced problems on trigonometric equations\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-II in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Trigonometry: Solved problems\". \r
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