document.write( "Question 1006712: find all solutions for cos 3x = -1/2 when 0< x <2pi \n" ); document.write( "
Algebra.Com's Answer #623713 by fractalier(6550)\"\" \"About 
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cos 3x = -1/2
\n" ); document.write( "3x = cos(-1) (-1/2)
\n" ); document.write( "3x = 2(pi)/3 or 3x = 4(pi)/3
\n" ); document.write( "x = 2(pi)/9 or x = 4(pi)/9
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