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)\"\" \"About 
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
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\n" ); document.write( "i believe your answers are:
\n" ); document.write( "x = 45
\n" ); document.write( "x = 135
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