document.write( "Question 209389: determine the exact values of x in the interval [0,2pie] that satisfy cos(2x)=0 \n" ); document.write( "
| Algebra.Com's Answer #158317 by Theo(13342)     You can put this solution on YOUR website! cos (x) = 0 when x = 90 and when x = 270 degrees. \n" ); document.write( "cos (2x) = 0 when 2x = 90 and when 2x = 270 degrees. \n" ); document.write( "2x = 90 when x = 45 \n" ); document.write( "2x = 270 when x = 135 \n" ); document.write( "----- \n" ); document.write( "i believe your answers are: \n" ); document.write( "x = 45 \n" ); document.write( "x = 135 \n" ); document.write( "----- \n" ); document.write( " \n" ); document.write( " |