document.write( "Question 1045455: Please help. I would like the answer in radians. Thanks!
\n" ); document.write( "2cos^2x + sinx -1 =0 \n" ); document.write( "
Algebra.Com's Answer #660910 by advanced_Learner(501)\"\" \"About 
You can put this solution on YOUR website!
\"%282%28cosx%29%5E2+%2B+%28sinx%29+-%281%29%29\"=\"0\"
\n" ); document.write( "since \r
\n" ); document.write( "\n" ); document.write( "\"%28%28cosx%29%5E2+%2B+%28sinx%29%5E2+%29\"=\"1\"
\n" ); document.write( "\"%28%281-+%28sinx%29%5E2+%29%29\"=\"%28cosx%29%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"%282%281-%28sinx%29%5E2%29+%2B+%28sinx%29+-%281%29%29\"=\"0\"\r
\n" ); document.write( "\n" ); document.write( "\"%28%282-2%28sinx%29%5E2%29+%2B+%28sinx%29+-%281%29%29\"=\"0\"
\n" ); document.write( "\"%28%281-2%28sinx%29%5E2%29+%2B+%28sinx%29+%29\"=\"0\"
\n" ); document.write( "multiply \"-1\" both sides\r
\n" ); document.write( "\n" ); document.write( "\"%28%282%28sinx%29%5E2%29+-+%28sinx%29-1+%29\"=\"0\"\r
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\n" ); document.write( "\n" ); document.write( "let \"u\"=\"sinx\"
\n" ); document.write( "\"%28%282%28u%29%5E2%29+-+%28u%29+-1%29\"=\"0\"
\n" ); document.write( "\"%282%2Au%2B1%29+%2A+%28u+-1%29\"=\"0\"\r
\n" ); document.write( "\n" ); document.write( "\"%282%2Au%2B1%29\"=\"0\" or \"%28%28u%29+-1%29\"=\"0\"\r
\n" ); document.write( "\n" ); document.write( "\"2%28u%29\"=\"-1\" or \"u+\"=\"1\"
\n" ); document.write( "\"u\"=\"-1%2F2\" or \"u+\"=\"1\"
\n" ); document.write( "\"%282sinx%2B1%29%2A%28sinx-1%29\"=\"0\"
\n" ); document.write( "\"%282sinx%2B1%29\"=\"0\" or \"%28sinx-1%29\"=\"0\"
\n" ); document.write( "\"%282sinx%29\"=\"-1\" or \"%28sinx%29\"=\"1\"
\n" ); document.write( "\"%28sinx%29\"=\"-1%2F2\" or \"%28sinx%29\"=\"1\"
\n" ); document.write( "\"x\"=\"7pi%2F6\",\"x\"=\"11pi%2F6\"
\n" ); document.write( "or \"x\"=\"pi%2F2\"\r
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